Looking for a sled for the wife this year as this will be her first sled. I have found an 09 550f summit with about 3000 miles on it. My question is what to look for and how durable are the Ski-Doo's 550 fanners? I have not had a Ski-Doo before or even a fan cooled. The unit has electric start and appears to be in good condition. We would ride 5000-7000 foot elevation and I am sure she would stick to the trail primarily. Any feedback would be appreciated.