I have a 2012 Summit with the 600 carb motor. Owned it since new, never had a carb issue and the carbs have never been off. I use nothing but ethanol free though. No issues with the sled except under high powder conditions the DES system goes a little crazy (gage lights blink and speedo cycles from high to low rapidly ) I shut it down wipe snow away from the DES key and restart and usually clears up. I had the full skid plate on it since new to add protection for the modules but that was a pain and always filled up with ice. Took it off last season and if I hit anything, well that is why I have insurance.
No other issues original belt, plugs and hyfax. IMO----a good value sled if you don't want all the new tech stuff.