Sugarloaf is one of my favorites. I usually stay at the Sugarloaf Inn, very cozy, a fun place to have a few beers after skiing. Very laid back. There are also lots of condos at the base if you have a larger group, all of which are either ski in ski out, or are accessed by a lift. Also have a luxury hotel if you're into that. There are some motels in the area, but I would stay on the mountain if you can, it's a great place to stay. Nice base area too. Quite a few shops and restaurants.
As far as the mountain is concerned, it's hard to beat the amount and variety of terrain they have. Huge mountain. Truly something for everybody. Long trails, rarely big crowds, usually lots of snow. I would have to call Sugarloaf a true skier's mountain, though. Not the over groomed intermediate cruiser's paradise that Sunday River is. Definately more flannel and duct tape types than Bogner one piece suites. Probably as close as you're going to get to western skiing in the east, particulary when the above tree line snowfields are open.
They've had some really good deals on their website, www.Sugarloaf.com.
I'm headed up there for Thanksgiving, got a great deal, looks like they will have a lot open by then.
However, this is not Aspen or Stowe. If you're not really into skiing, there's not much else to do.
All and all, I would still call it the best skiing experience available in the east.