I put up with one for a season. Quality was OK. The bag itself weighs more than my entire sleep system now. It's way too heavy and bulky for anything but truck camping.
I have the -10 version. Really warm but too small for my liking. I'm 6'1" with a 48" chest for size comparison. I can barely get it zipped up.
Quality seems to be descent. I'm going to get a wider bag for next year.
Its a snug fitting bag, and as mentioned most definitely a base camp / car camping type bag. I have the -10 and its help up pretty good over the few years I have had it. I think it sleeps pretty warm, but not a true -10.