It's my most-used bag (of several options); I have well over a hundred nights in it and it's still in great shape.

Do also look at the FF Hummingbird, which can be had in full or half-length zip and one of three fabrics. That's the UL's closest competition in quality, performance and weight, and it's more customizeable.

I only caution potential UL buyers that it's a snug bag, so make sure it suits you in that regard. Mine's a long, which provides valuable extra wriggle room.