We bought the 450i in september of 2014. We have put 2560 miles on the machine since then. So far the only problem we have encountered is excessive tire wear on the front tires. I don't know if it's the cheesy stock maxxis tires or a problem with the front end alignment. I am going to take it to the dealer and have it checked. We have used this machine in mud, snow , etc and are quite pleased with how it performs. Plenty of power for trail riding, even on steep muddy terrain. The bed is a great feature, we haul in a jag of firewood everytime we ride. Unfortunately, we have been having a hard time finding accessories and Kymco offers very few choices. We are able at this time to purchase a windshield from the dealer for $350, which I think is pretty high for a plastic one. I bought a piece of plexiglass last winter and cut it to size, used zip ties to mount it and gorilla tape to help secure it to the machine and it worked great. $29 was a little more reasonable than $350. We mounted a boss audio stereo system to the roll cage and a led light bar to the front of the machine directly above the winch and they both work great. The only downside the the machine is availability of accessories.