We had a Polaris 700 when they first came out, talk about a power house... could pull a wheely that would flip it the first bit we had it, but it seemed to lose a step, we also had a 350 honda rancher that we had for a few years before the popo, rode them together and the polaris was in the shop every few months, always the same problem. it would get sluggish and barely run, the mechanics were always askin us where the hell we rode that thing, our response was everywhere we take our honda and that is still runnin like a top. I don't know if we got a lemon or some faulty mechanic work but it really burned me on polaris.
So we eventually traded the 700 sportsman off for a Honda Rincon, the 650 carbed one, and it was a heck of a machine, after a couple years we traded up for the 680 fuel injected, and that thing is a freakin rig. it's got prolly around 3000 miles on it now and still drives like the day we brought it home, I'll give it to the popo for power and speed, but the honda is hands down better in reliability and handling.
The rancher I mentioned before is a testament to honda reliability, we got it new in 1999 and my brother and sister and I rode the bejesus out of it. I think its got 12-13000 miles on it. it is still machanically sound but the body has taken some pretty sever beatin over the years, its parked away in the shed now, if I threw a battery in it she'd be ready to rock.
I don't have much experience with the other big brand names, so I can tell you good or bad about them, I know I would never pay for another polaris again, but thats just my opinion. I wouldn't buy anything else but a honda, the other brands may be good, but if it ain't broke don't fix it...