It wasn't through DVC, but I stayed at Boyne last MLK for a long weekend in a 2BR. Nice units, though the 2nd BR was a little small. Skiing was fine by Michigan standards, but in no way Colorado, or even the northeast. We are headed up to Shanty Creek this weekend. I think Boyne is in the DVC list, but Shanty might not be.
There are 2-3 different RCI resorts at Shanty Creek. We stayed in one that was not on the DVC list. And, that's fair; the units are dated, but were impeccably clean and quite comfortable. I do have one lined up at the DVC-listed resort for next year's MLK weekend, but can't comment on it.
Shanty as a destination was fine. I just posted a review over at TUG (tug2.net).