The main difference between Shark ZU561, ZU62, ZU503AMZ and NV360 are as follows.

• Brushroll Off Option
  All of them have carpet and hard floor settings, but only the NV360 brushroll stops spinning when set to hard floor mode. The ZU561, ZU62 and ZU503AMZ brushroll keep rotating in both carpet and hard floor settings.
• Self Cleaning Brushroll
  The NV360 is the only one that does NOT feature the self cleaning brushroll which is claimed to reduce maintenance.
• Dust Cup Size
  The ZU62 has a much larger dust container than the ZU561, ZU503AMZ and NV360. The ZU62 bin has a capacity of 2.8 dry quarts versus approximately 0.9 quarts on the other three.
• Lift Away
  The ZU62 is the only one that does not feature the Lift Away function.
  The Lift Away function allows you to detach the pod from the main unit, and carry it around to clean high and low areas.
• Attachments
  The Zu561 comes with a Duster Crevice Tool, a Hair Removal Multi-Tool, and a Wide Upholstery Tool;
  the ZU62 comes with a Duster Crevice Tool, an Upholstery Tool and a Dusting Brush ;
  the ZU503AMZ comes with an Upholstery Tool and a Pet Crevice Tool;
  and the NV360 comes with an Upholstery Tool and a Crevice Tool.

  Duster Crevice Tool is a 2-in-1 cleaning tools in one, it has soft bristles which can be slided up or down to allows you to use it as a crevice tool or dusting brush.

  Hair Removal Multi-Tool is a convertible tool for cleaning tough pet messes, it has a rubber bristle
  brush for cleaning stubborn hair from
  carpeted areas, and the rubber bristle
  brush can be removed to turn it into an upholstery tool for cleaning couches and bedding.

  Wide Upholstery Tool has a wider cleaning path than the Upholstery Tool, it helps remove pet hair, dust, and large debris from delicate upholstered surfaces such as mattresses, couches, curtains, lampshades.

  Upholstery Tool removes pet hair, dust, and large debris from delicate upholstered surfaces.

  Dusting Brush dusts and cleans surfaces like fans, blinds, lampshades, and keyboards.

  Pet Crevice Tool removes pet hair from corners, between couch cushions, and other hard to reach areas.

  Crevice Tool is for cleaning corners, baseboards, tight spaces, and ceilings.

• Hose Length
  The ZU62 has the longest power cable which gives you up to 12 feet of total reach to clean around your home.
• Power Specifications
  The wattage and amperage of ZU561 are 800W and 6.7A,the ZU62 are 1150W and 9.5A, ZU503AMZ and NV360 are 1200W and 10A.
• Color
  The Zu561 is Peony Red,
  ZU62 is Pewter Grey Metallic,
  ZU503AMZ is Teal,
  and NV360 is Blue.

Compare Shark ZU561,ZU62,ZU503AMZ,NV360 Specifications

Similarities between them:

• They are corded with a 25-foot power cable, NO automatic cord rewind.
• Have suction control slider that allows you to customize the suction power to deal with different cleaning jobs.
• Power control is NOT located on the handle, but at one side of the machine near the top of the pod.
• Swivel Steering lets you maneuver the vacuum around your home easier.
• Have one carpet setting and one hard floor setting.
• No headlights for illuminating dark spots.
• Feature Anti-Allergen Complete Seal with HEPA filter to captures and traps over 99.9% of dust, dirt, and allergen particles down to 0.3 microns.
• They are bagless.
• Carry 5-year limited warranty.

The difference between Shark LA500, LA500WM and LA502 Rotator Lift-Away ADV Upright Vacuum with DuoClean PowerFins and Self-Cleaning Brushroll are as follows:

• Accessories
  The LA500WM comes with a Crevice Tool and an Upholstery Tool,
  the LA500 comes with a Pet Crevice Tool and a Pet Multi-Tool,
  the LA502 comes with a Crevice Tool, a Pet Multi-Tool, and a Self-Cleaning Pet Power Brush.
  The Crevice Tool can be used to clean corners, baseboards, tight spaces, and ceilings.
  The Pet Crevice Tool help remove pet hair from like corners, stairs, and tight areas like between couch cushions.
  The Pet Multi-Tool is a convertible tool, it has stiff bristle brush which can be removed. You can use it with the brush to clean stuck-on debris, or remove the brush to convert it into an upholstery tool for picking up stubborn pet hair and large piles of debris.
  The Self-Cleaning Pet Power Brush is a handheld tool for removing pet hair and ground-in dirt from carpeted stairs, upholstery, and other above-floor areas. It features Shark’s self-clean technology which help reduce maintenance.
• Color
  The LA500WM is in Mocha color, the LA500 is Grey/Silver, whereas the LA502 is Metallic Grey/Silver and gold.

Otherwise, they are the same.

Similarities between them:

• Upright vacuum cleaner with lift away pod for versatile cleaning.
• Corded with a 25-foot power cable.
• Led headlights illuminate low light areas and reveal hidden debris for a thorough cleaning.
• DuoClean PowerFins tackle carpet and hard floor cleaning jobs.
• Self-cleaning brushroll to minimize maintenance.
• Anti-Allergen Complete Seal system with HEPA filtration captures and traps over 99.9% of particles down to 0.3 microns.
• Carry 5-year limited warranty.
• Swivel Steering for easy maneuvering the vacuum around the home.
• Fingertip suction control to customize the suction power for cleaning different surfaces.
• Have hard floor and carpet settings.

Some questions and answers:

• Can you turn off the brushroll for cleaning bare floors?
  No. The brushroll keeps spinning in both hard floor and carpet modes.
• Can you detach the rollers for cleaning up?
  The soft roller can be removed for cleaning.
• Can you lift away the pod and use the motorized floor head to get understand furniture?
  No. They are Lift-Away models, not Powered Lift-Away, so you can detach the pod and use a motorized tool.
• Is the HEPA filter washable?
  Yes. It’s washable.
• Is there places to store the tools on board?
  There are two tool storage posts.
• Do they have automatic cord retractor?
  No. You wind the cord manually.
• Are the power setting controls on the handle?
  The on/off control is located on the unit, the handle only has suction control slider.

The difference between Shark LA700 and LA702 Rotator Pet Lift-Away ADV Upright Vacuum with DuoClean PowerFins HairPro & Odor Neutralizer Technology are as follows:

• Accessories
  The LA700 comes with a Crevice Tool and an Upholstery Tool whereas the LA702 includes the above two tools and one additional Anti-allergen Dust Brush.
  The Crevice Tool is for cleaning corners and other tight spaces;
  the Upholstery Tool is for picking up pet hair, dust, and large debris from upholstered surfaces;
  the Anti-allergen Dust Brush has nylon fiber bristles designed for removing fine dust and allergen particles from the most delicate surfaces.
• Color
  The LA700 is in Sage color whereas the LA702 is in Wine Purple.

Otherwise, they are the same.

Similarities between them:

• DuoClean Powerfins Hair products one powerfin roller combined with one soft roller to clean carpets and hard floors, and picks up dirt, debris, and hair in every pass.
• Self-cleaning brushroll reduce maintenance.
• They are corded and have 25-foot cable.
• Suction Control Slider on the handle for adjusting the suction power to tackle different cleaning jobs.
• Life away function allows you to lift away the pod for portable cleaning such as cleaning the stiar.
• Odor neutralizer kit to guard against bad odors and emit fresh air.
• Anti-Allergen Complete Seal Technology with a HEPA filter traps 99.97% of dust and allergen particles down to 0.3 microns inside the vacuum cleaner, keeping them out of the air you breathe.
• Swivel Steering for easy and smooth maneuvering.
• LED headlights illuminate dark areas and reveal hidden debris.
• NO brushroll off option.
• Carry 5-year limited warranty.

Some questions and answers:

• What is the weight of the lift-away canister?
• It weighs about 6.3 pounds.
• Do they have powered lift away?
  No. They only have lift away, not powered lift way. You can not detach the pod and using a powered nozzle attached to the wand or handle.
• Can you turn off the brushroll when cleaning delicate floors?
  No. There’s no brushroll off option, it keeps spinning in both carpet and hard floor mode.
• Which Shark vacuum is the highest rated?
  The Shark NV360 Navigator Lift-Away Deluxe Upright Vacuum is one of the best to buy Shark vacuum cleaners.
• Why is my Shark losing suction?
  This may be caused by full dust cup, dirty filters, clogs inside air path.
• How do you clean a Shark HEPA filter?
  Most Shark vacuum HEPA filters are rinseable, and they need to be rinse the regularly to maintain your vacuum’s suction power. When rinse the HEPA filters, rinse with cold water only. Pay attention that the filters have to be air-dried before reinstalling.
• How does Shark compare to Miele vacuum?
• The Miele vacuums are more expensive with better build quality.