I've been using the 20' version of Cabela's Boundary Waters Mummy Bag.  I enjoy the extra width of the bag, so I can easily turn and the bag stays put.  I have historically done paddling trips in the mid-May time slot, so having the extra warmth has always been welcome.  After last season's trip Quetico trip, I checked the reported temp's for Ely for that period.  At least 3 days were in the 27-28' range.  Bag was still very comfortable.

While I don't use the dry bag it came with (opted for a compression-style bag that then goes into a waterproof bag containing other gear), I am conscious of keeping the bag dry, even when its in the tent.  I've even been known to wrap my rain gear top around the foot of my bag when on a slant to keep the foot dry even if it should rub against the tent wall overnight.

I do have other golite gear and have been consistently happy with its performance.

dd