Club Med is a unique type of ski vacation. As PinHed has said, Copper's Club Med was the only winter CM in the country, until they opened another one last season in Crested Butte.
They operate as a "resort within a resort," independently of the rest of Copper Mountain. Club Med's instructors work for Club Med exclusively, with no ties to the Copper Ski and Snowboard School, although we do invite them to participate in our training. Many of their instructors are foreign, with foreign certification, and the Club Med school does virtually no in-house training. But they do pay more for certified instructors, so there are many eager participants in our (Copper Mountain's) certification training program.
Part of the Club Med "philosophy" involves encouraging guests and employees alike to mingle and participate in group activities. Their rooms are intentionally austere--not uncomfortable, but offering very few amenities (I don't think they even have televisions at Copper Mountain)--they want to entice you NOT to just "hole up" in your room. It's a popular idea, apparantly, in Europe, but many Americans seem to prefer a little fancier accomodations. The Crested Butte Club Med, I understand, is a bit more luxurious.
The food at Club Med at Copper is very good--buffet style with a fairly lavish variety of offerings.
As PinHed noted, the instructors work night and day, doing everything from helping move luggage in when the new guests arrive to little entertainment skits in the evenings. They get little time off, and are expected to mingle with the guests whenever possible. But they are, for the most part, VERY happy, it seems to me!
Because they do not work for Copper Mountain, Club Med's instructors and their groups do NOT have lift line privileges. That's something to keep in mind during busy periods. Many people take ski lessons just to avoid lift lines, but to do that at Club Med, you will have to hire a Copper Mountain instructor (which is NOT included in your Club Med package!).
That's about all I know about Club Med. It is a vacation that suits some people perfectly, but it's probably not for everyone.