I used it only for 1 class so far (contract) and it seemed pretty legit. In fact, it saved me (or I think it did unless my professor had a different view) on a few questions since my professor didn't cover it and totally tested it.
Generally barbri is a kind of last resort for me. It has a good outline, covers everything, and I think it's great for an end of the semester summary in a short time.
The Emmanuel and Gilberts outlines aren't wrong (most of the time), but just don't explain it too well (for some of them). However hornbooks, commercial outlines, and E&E's all combined give a good picture of what the law is, and where everyone stands in believing what it should be.
BarBri = good outline for a fairly general review I think, but only if you know the subject well. This way, you'll understand what views it's taking.