I had a 500 and it ran 85 mph on GPS. Your 600 had some serious issues! I ride with a guy with an 011 600 and he can do over 90 all day long. Most comfortable sled I ever had! Just not great to look at but when you are riding, who cares?Polaris had me for ten years until they thought changing stickers year after year meant they could keep calling it a new sled. Cat had me for the next ten until the twin spar. Nothing more embarrassing than being on a 600 that only does 70mph and uses twice the gas of every other sled in the group. Ski Doo had me for the next ten. Nothing bad to say. Tried the new Polaris XC 850 this season and all I can say is wow. Bad on gas and oil, but if that is the price of a smile the whole ride, I’ll gladly pay it. All manufacturers stumble but I’d hate to see any go under.