I have had my 2010 550xp for a couple of months now and it is awesome. So far it has plenty of power and a great ride. I weigh about 190 and the wife weighs 115. Plenty of room for me on the back if ride on the back and the same for the wife. We wanted a four wheeler but couldn't afford to buy two at once. When we get another quad i will buy a 2-up and just get a solo seat for it. Great gas mileage so far also. We went out with a friend that was useing a 01 Trailblazer while he used a whole tank of gas we only used one gas bar on the gauge. The other day i went out with a buddy that has a kawi 400 sport and was able to do everything he did. At first he pulled away but i did get it up to 51mph. So it has plenty of speed. The hills he couldn't over i just put it in 4 wheel low and had no problem. Looked at artic cats but went with polaris just for the fact that they took my r1 in on a trade.

 

Just bought 2012 2-up, Two reasons, ride comfort for passenger and when there not on, I like the extra length for climbing hills in the woods. I ride more in winter months and like the factory lock & ride items available. I had the X2 and it was great except that seat arrangement was not as plush as lock and ride system with lock and ride hand grips, even heated for her.