Shark Rocket Professional and Shark Navigator are 2 Shark upright vacuum cleaners. If you are deciding between these 2 vacuums, here is a comparison chart that might help you make a decision.

Shark Rocket Professional vs Navigator

	Shark Rocket Professional	Shark Navigator
Design	Upright	Upright
Power Source	Corded	Corded
Cord Length	30 feet	30 feet
Technical Specifications	120V., 60Hz, 700 Watts, 6 Amps	120V., 60Hz, 1200 Watts, 10 Amps
Motorized Brushbar	Yes	Yes
Brush On/Off	Yes	Yes
Bagged or Bagless	Bagless	Bagless
Dust Cup Capacity	0.8 dry quarts to the fill line and 1.8 dry quarts of real usable capacity	2.4 dry quarts, larger than the Shark Rocket Pro.
Anti-Allergen Complete Seal Technology	Yes	No
HEPA Filter	Yes Traps over 99.9% of dust and allergens.	No
Cleaning Path	11”	9.25"
Suction Control	No no control to regulate the suction.	No
Weight	13 pounds, lighter than the Navigator	about 15 pounds
Dimensions	45.28" x 11.3" x 14.1"	43.7” x 14” x 11.9”
Headlights	Yes LED lights illuminate dark areas to help you pick up hidden dirt.	No
Swivel Steering	Yes	No
Manual Height Adjustment	No Adjust automatically, you cannot manually control the height of the vacuum to match carpet's/rug's pile height.	No
Cost	Shark Rocket Pro is more expensive than the Shark Navigator.
Color	Steel Gray with Orange	Lavender/Purple
Manual	Shark Rocket Pro Manual Download Link from Official Site, if the link not work, please visit sharkclean.com to search it yourself.	Shark Navigator Manual Download Link from Official Site
Warranty	5 year	5 year

1, Shark Rocket Pro is a bit lighter, Navigator has a larger dust bin.
2, Shark Rocket Pro has wider cleaning path and the swivel Steering.
3, If you care about the HEPA filter, then you should choose the Shark Rocket Pro. The Shark Rocket Pro features the Anti-Allergen Complete Seal Technology and HEPA filter that can captures over 99.9% of allergens, and output cleaner air. While the Shark Navigator does not include a HEPA filter.
4, Like the LED lights for cleaning dark spots? Choose the Shark Rocket Pro.
5, But Navigator is cheaper than the Shark Rocket Pro.

Overall, they both have some advantages, just pick the one that meets your needs.

At this moment, the only place you can find the NV370 model is on Amazon. Even at Shark official website, you cannot find any info about it.
Amazon call the NV370 The Shark Navigator Lift-Away Pro Special Edition. A special edition of the Navigator Lift-Away Pro. What makes it special is the Gentle Deep Clean Technology with Superior Carpet Cleaning, and it is approved by the CRI (The Carpet and Rug Institute http://www.carpet-rug.org/About-CRI.aspx).

According to the info listed on Amazon, the only difference between NV370 and NV356E is the Brush Roll they come with. The NV370 features Premium Brush Roll whereas the NV356E uses Standard Brush Roll.
Then what’s the difference between the Standard Brush Roll and the Premium Brush Roll? The Shark customer service did not answer clearly on this. They just said that they are associated with different models. And they told me that the only difference between the NV356E and the NV370 is where they sold. They did not mention anything about the Gentle Deep Clean Technology or the Brush Roll.
Shark definately have to improve customer satisfaction. I find that many people always get confused by the similar product versions. At least, they should make the products info more clearly to save customers time on choosing a right model.

If you know other difference between these 2 Shark Navigator Lift-Away Pro versions, please share it below.