We're new members & have a Dec UY. I didn't know that Jan. was such popular time for members calling in for Dec. ressies - until I tried to call in during Jan. for a 7 mo. ressie in Aug. at a resort other than our home resort! I would say that the MS phone lines (or lack of) are my biggest problem with having a Dec UY and trying to call in Jan - along with all of the 11 mo. competition as MS just doesn't have the amt. of lines or staff to handle the volume that they should have. But I like Dec. in that we mostly travel in the summer - so if we decide to book outside our home resort for a June, July or Aug ressie, our 7 mo. window would let us be able to call in Nov, Dec or Jan - and I think that works well for us for planning at work & for getting a summer ressie when we want it.