Well i got my 2000 Grizzly after selling my 89 Big Bear, and Hell Ya what a machine. I have 600KM's on it and I love it. Power like you wouldn't believe it is like being on a sled, with 4 wheels instead. It can work hard and you can take it out of 4wd. Best of all it has not a problem yet. The people i know that have them don't have major problems, like with well you know!
The Grizzly does not have sensors when in 4wd so you don't have to worry about being in or not. The Polaris only engages when the back wheels spin.
All the Grizzly needs for those die hard mud guys is a DIFF Lock for the front end.
Hope this helps!

 

I have ridden a Honda 300 4X4. I own a '99 Wolverine myself and my dad owns a '98 Grizzly. It depends on what kind of places your going to be going through. If your talking REALLY extreme mudding I'd take a Grizzly cause their handling is utterly awesome for its size and they are a power house. But on the other hand I enjoy the sportier side of riding so I have a Wolverine. And to settle up the score we have never gotten either one of these quads stuck so I guess its a matter of preference to what kind of ride you want. If you want you can e-mail me for further details. =- )