here's a link to soem Vinson info:
the vinson has one of the closest CC engines of the 500 class. you get 493cc, compared to the formans 475cc. along with the added compression of the vinson (10.2:1) it's a torque monster!! now granted it may not ride the best, compared to some of the others, but the performance is worth it!
the group we ride with concist of: 2- 660 GRIZ, 500 Forman, 400 Eiger (my co-worker), 2-400 Big Bears, and my 500 Vinson.........
i've been complimented on my choice of ATV's buy the 2 guys that drive the grizzly's about the performance of the Vinson! they had never riden with anyone that had a Vinson. my friends Eiger is darn good machine too! the Vinson just is an over all great machine! kinda reminds me of a lifted 4x4 truck ...........it's powerfull, rides kinda rough, but not bad enough to be uncomfertable, sturdy and solid!
it pulls me around with ease, i'm 6'2"/230lbs, and id don't skip a beat when my wife goes riding with me either!
for the $ i'd go with the Vinson! the difference between the Forman, and the Vinson in price was $400 after all my negotiating between dealers........i'm glad i went Suzuki!! when we get around to our next purchase (for my wife), it will be a Suzuki (either an Eiger or a Vinson)!!