As far as I know, there is no mechanical difference between Eureka AS1104A and AS1104AX. The AS1104A is a general version while the AS1104AX is a BestBuy exclusive version. I contacted Eureka customer support, they told me that the “AX” comes with an extra part, like an extra wand, or filter, or belt, etc. And I chatted with a BestBuy customer service person online, and the person I contacted told me that the AS1104AX comes with both a PET Power Paw and a stair and upholstery brush. These 2 tools are turbo driven upholstery nozzles, the PET Power Paw is built with pet in mind. It has Plastic Teeth to loose the hair and a rubber strip and bristles pick up the hair. It seems that the Stair & Upholstery Brush (part number 81295-2) does not have the plastic teeth and rubber strip. Product info on Eureka.com shows that the AS1104A only has the PET Power Paw. So, I think the AS1104AX comes with the extra upholstery nozzles – a Stair and Upholstery Brush.
These two both feature cord retractor, brush roller On/Off switch, manual pile height adjustment and HEPA charcoal filter for cleaner air.

Compare Eureka AS1104A and AS1104AX

	Eureka AS1104A SuctionSeal Pet Bagless Upright Vacuum	Eureka AS1104AX SuctionSeal Pet Bagless Upright Vacuum
List Price	MSRP: $199.99 $139.99 on eureka.com on August 25, 2014	not available on eureka.com on August 25, 2014
Exclusively at Best Buy	No	Yes
Designed Specifically for Pet Owners	Yes	Yes
Power Source:	corded	corded
Cord Length	27 feet	27 feet
Auto Cord Rewind	Yes	Yes
Power Rating:	12 amps	12 amps
Cleaning Path	14 inch	14 inch
Motorized Brush Roll	Yes	Yes
Brushroll On/Off Switch	Yes control is on the base	Yes control is on the base
Hose and Wand Reach	12 ft	12 ft
Bagged or Bagless:	Bagless	Bagless
Weight	20.7 lbs	20.7 lbs
Cleaner Dimensions: W x L x H	14.2" x 15.3" x 43.8"	14.2" x 15.3" x 43.8"
Color	Black with Red, Yellow	Black with Red, Yellow
HEPA Filtration	Yes	Yes
Washable Dust Cup Filter	Yes	Yes
Height Adjustment	Yes Manual	Yes Manual
Flip-Bottom Dust Cup	Yes	Yes
Tools	PET Power Paw, Wand, Crevice Tool, Pet Upholsery Brush	PET Power Paw, Wand, Crevice Tool, Pet Upholsery Brush * Stair and Upholstery brush (*not confirmed)
SuctionSeal® Technology: to maximize suction power	Yes	Yes
AirSpeed® Technology decrease the distance for dirt to travel, increases the amount of airflow for suction	Yes	Yes
Airflow Control Switch diverts the suction power to the floor or the hose	Yes	Yes
Edge Cleaning Brush	Yes	Yes
Warranty	3-year limited warranty	3-year limited warranty
Manual:	AS1104A Owner's Guide	Eureka AS1104AX User Guide
Official Link	http://www.eureka.com/en-US/Vacuums/Uprights/SuctionSeal/Uprights-SuctionSealPet-AS1104A.aspx	http://www.eureka.com/en-US/Vacuums/Uprights/SuctionSeal/Uprights-SuctionSealPet-AS1104AX.aspx

If you have experience about these 2 Eureka SuctionSeal PET vacuum cleaners to share, feel free to comment below.

There is slight difference between Eureka AS1101A and AS1104A, most of their specs are the same.
The tiny difference is the color and the tools they come with.
The Eureka AS1104A is a pet model that is designed particularly for homes with pets. It includes a turbo driven PET Power Paw and a Pet Upholstery Brush with rubber strip that are good for removing pet hair around your house. The AS1101A does come with similar tools, but they are not specialized pet tools. To help eliminate pet odors, the AS1104A also adds an activated charcoal patch on the filter. However, both models have HEPA filtration to remove pet odors and expel cleaner air.
More comparison, read the table below.

Compare Eureka AS1104A and AS1101A

	Eureka AS1104A SuctionSeal Pet Bagless Upright Vacuum	Eureka AS1101A Suctionseal Bagless Upright Vacuum
List Price	MSRP: $199.99 $139.99 on eureka.com on August 24, 2014	not available on eureka.com on August 24, 2014
Designed Specifically for Pet Owners	Yes	No
Power Source:	corded	corded
Cord Length	27 feet	27 feet
Power Rating:	12 amps	12 amps
Cleaning Path	14 inch	14 inch
Motorized Brush Roll	Yes	Yes
Brushroll Shutoff	Yes	Yes
Hose and Wand Reach	12 foot	12 foot
Bagged or Bagless:	Bagless	Bagless
Weight	20.7 lbs	20.7 lbs
Cleaner Dimensions: W x L x H	14.2" x 15.3" x 43.8"	14.2" x 15.3" x 43.8"
Color	Black with Red, Yellow	Black with Blue, Yellow
HEPA Filtration	Yes	Yes
Washable Dust Cup Filter	Yes	Yes
Auto Cord Rewind	Yes	Yes
Height Adjustment	Yes Manual	Yes Manual
Flip-Bottom Dust Cup	Yes	Yes
Tools	PET Power Paw, Wand, Crevice Tool, Pet Upholsery Brush	Stair & Upholstery Turbo Nozzle, Extension Wand, Crevice Tool, Dusting Brush
SuctionSeal® Technology: to maximize suction power	Yes	Yes
AirSpeed® Technology decrease the distance for dirt to travel, increases the amount of airflow for suction	Yes	Yes
Airflow Control Switch diverts the suction power to the floor or the hose	Yes	Yes
Edge Cleaning Brush	Yes	Yes
Warranty	3-year limited warranty	3-year limited warranty
Manual:	AS1104A Owner's Guide	Eureka AS1101A User Guide
Official Link	http://www.eureka.com/en-US/Vacuums/Uprights/SuctionSeal/Uprights-SuctionSealPet-AS1104A.aspx	http://www.eureka.com/en-US/Vacuums/Uprights/SuctionSeal/Uprights-SuctionSeal-AS1101A.aspx

1, Brushroll On/Off Switch
One of the key difference between them is that the brush roll on the AS1000A cannot be shut off while the AS1101A has a brush roll on/off switch.

2, Cord Winding
The AS1101A is equipped with Auto Cord Rewind system while the AS1000A uses manual winding.

3, SuctionSeal Technology
The AS1101A features SuctionSeal Technology, Eureka claim that it can improve suction power for deep cleaning, while the AS1000A does not have.

4, Wheels
The AS1101A has improved rubberized wheels to protect hardwood and delicate flooring.

You can read more specs comparison below:

Compare Eureka AS1000A and AS1101A

	Eureka AS1000A AirSpeed Bagless Upright Vacuum	Eureka AS1101A Suctionseal Bagless Upright Vacuum
List Price	not available on eureka.com on August 23, 2014	not available on eureka.com on August 23, 2014
Power Source:	corded	corded
Cord Length	27 feet	27 feet
Power Rating:	12 amps	12 amps
Cleaning Path	14 inch	14 inch
Motorized Brush Roll	Yes	Yes
Brushroll Shutoff	No	Yes The brushroll on/off switch allows you to select proper mode to clean carpets or bare floors.
Hose and Wand Reach	12 foot	12 foot
Bagged or Bagless:	Bagless	Bagless
Weight	18.5 lbs.	20.7 lbs
Cleaner Dimensions: W x L x H	14" x 12" x 43.5"	14.2" x 15.3" x 43.8"
Color	Black with Yellow	Black with Blue, Yellow
HEPA Filtration	Yes	Yes
Auto Cord Rewind	No	Yes
Height Adjustment	Yes Manual	Yes Manual
Tools	Upholstery and Dusting Brush, Crevice Tool	Stair & Upholstery Turbo Nozzle, Extension Wand, Crevice Tool, Dusting Brush
SuctionSeal® Technology to maximize airflow for powerful cleaning performance	No	Yes
AirSpeed® Technology decrease the distance for dirt to travel, increases the amount of airflow for suction	Yes	Yes
WhirlWind® Cyclonic Technology maintains suction power and separates large debris from fine dust	Yes	Yes
Airflow Control Switch diverts the suction power to the floor or the hose	Yes	Yes
Warranty	2-year limited warranty	3-year limited warranty
Manual:	AS1000A Owner's Guide	Eureka AS1001A User Guide
Official Link	http://www.eureka.com/en-US/Vacuums/Uprights/AirSpeed/Uprights-AirSpeed-AS1000A.aspx	http://www.eureka.com/en-US/Vacuums/Uprights/SuctionSeal/Uprights-SuctionSeal-AS1101A.aspx

Any reviews on these 2 Eureka vacuum cleaners will be appreciated.

The difference between Eureka AS1000A and AS1001A that we can find is the cleaning reach and color.
** According to Eureka, the AS1000A has a cord length of 27 feet while it is 32 feet on the AS1001A. And the hose and wand on AS1000A provides a 12 feet reach, plus the 27 feet cord, its cleaning reach is 39 feet; while the hose+wand reach on AS1001A is 14 feet, thus it has a total 46 feet cleaning reach.
** The base on the AS1000A is black while it is yellow on the AS1001A.

Compare Eureka AS1000A and AS1001A

	Eureka AS1000A AirSpeed Bagless Upright Vacuum	Eureka AS1001A AirSpeed Gold Bagless Upright Vacuum
List Price		$97.99 on eureka.com on August 22, 2014.
Power Source:	corded	corded
Cord Length	27 feet	32 feet
Power Rating:	12 amps	12 amps
Cleaning Path	14 inch	14 inch
Motorized Brush Roll	Yes	Yes
Brushroll Shutoff	No The roller brush does not turn off.	No
Hose and Wand Reach	12 foot	14 foot
Bagged or Bagless:	Bagless	Bagless
Full Bin Indicator	Yes	Yes
Weight:	18.5 lbs.	18.5 lbs.
Cleaner Dimensions: W x L x H	14" x 12" x 43.5"	14.5" x 12" x 44"
Color	Black with Yellow Base is Black	Black with Yellow Base is Yellow
HEPA Filtration	Yes	Yes
Auto Cord Rewind	No	No
Height Adjustment	Yes Manual Multiple adjustment	Yes Manual Multiple adjustment
Tools	Upholstery and Dusting Brush, Crevice Tool	Crevice Tool, Upholstery and Dusting Brush
WhirlWind® Cyclonic Technology maintains suction power and separates large debris from fine dust	Yes	Yes
AirSpeed® Technology decrease the distance for dirt to travel, increases the amount of airflow for suction	Yes	Yes
Airflow Control Switch diverts the suction power to the floor or the hose	Yes	Yes
Power Switch Location	On the base	On the base
Warranty:	2-year limited warranty	2-year limited warranty
Manual:	AS1000A Owner's Guide	Eureka AS1001A User Guide
Official Link	http://www.eureka.com/en-US/Vacuums/Uprights/AirSpeed/Uprights-AirSpeed-AS1000A.aspx	http://www.eureka.com/en-US/Vacuums/Uprights/AirSpeed/Uprights-AirSpeedGold-AS1001A.aspx