I've been using it this year. Overall I have been satisfied with it. I really like the updated pad sleeve that allows you to use almost any pad. I have the long version (not the long/wide) and it is roomy enough for me (I'm a fat kid). Its fairly light for its size but I think the weight savings come at a loss of warmth.
My only gripe is that it doesn't seem to be a true 15° bag. I haven't really pushed it hard to see how cold I can take it, but it never seemed really toasty at cooler (35-40) temps. For 3 season camping in temps above 30-35, its great. If you want to take it down below freezing, look at the 0. IMHO, the BA temp ratings are really optimistic.
Hope this helps. Let me know if you have any other questions.