I don't own a timeshare at a ski resort, but I do have one in the Caribbean.
Things to ask:
* Is it deeded property (ie, you own a percentage of the building/property once it's paid off) or are you buying a week a year for 25/30 years and then own nothing?
* Are you subject to assessments? I've heard of people having to cough up a few grand to cover damage caused by snow and ice, even if not to their actual unit.
* Do they carry 100% rebuild insurance in the event of a disaster?
* Who's responsible for maintaining appliances/furniture/decor, and what's the expected life of these items? You don't want to own a dated timeshare if you ever plan on renting.
* If you want to rent your week, can you do it yourself, or do they have a management company that can do it for you? What are the fees associated with renting it out? How much are units renting for? (Check ebay for your resort...many people rent weeks here).
* What's the current resale value of the unit you're looking at? You can find this easily enough on the internet.
* What are the maintainence fees, and how much are they going up each year?
* Is it a premium resort? If you intend to rent your week now and again, how easy will it be to rent and/or swap for a week at a different resort? Log on to www.intervalworld.com
to see how your resort fares.
That's all I can think of at the moment. I hope it was of some help!