I used this bag this fall on the North rim of the Grand Canyon. Great fit, lots of room in the bottom for your legs and feet. The sleeping pad slide in feature is great, no more rolling off of your pad, or having your bag role up when you move. Bag was not quite as warm as other 0 degree bags that I have used but I think this is due to the extra room in the foot box, not a bad trade off.

This is a 0 degree bag, and as such requires a sleeping pad that can also do it's job in below freezing temps. I paired this with an exped 7 and was disappointed with the outcome (I love the pad, BTW). the exped is about 2.75" thick, and having a pad that thick in the sleeve pulled the top of the bag tighter around me, felt like I was sleeping on a skinny bed with the sheets tucked in real tight all around me. I still had good foot room to move them side to side, but the bag was pulling down on my toes. same thing around my torso -- room for my elbows, but pulled tight on my chest. I then tried just putting the pad underneath the bag, but it just doesn't work that way -- you only get complete coverage from the insulated portion of the bag if the pad is in the sleeve. Simply placing the bag on top of the pad leaves "dead zones" where you have no insulation between you and the open air (the bag is well designed where if the pad is in the sleeve, this doesn't happen). It would probably work better with a thinner 4 season pad, like the thermarest prolite 4, or the pac outdoor all out aero mt., but then those aren't thick enough for me to sleep on my side and keep my shoulders/hips off the ground that well(I weigh about 200).
Also, no pocket for a watch or whatever. The draft collar doesn't cinch up like some other cold weather bags, but it is a little heavier so the weight keeps it on your body.
I tested this bag vs. the mountain hardwear switch 5, and I'm going with the switch 5 -- with the expander unzipped it has equal shoulder room, and even though it is more narrow in the feet, I felt like I had more room because it wasn't pulled tight by the pad.

But zero degrees is pushing it. I've spent several sub 20F nights in it and been comfy. Then there was a night at 10k in January where the wind HOWLED and even behind a burly tent wall and a snow barrier outside there was enough air moving around to chill me out pretty good. I don't blame the sleeping pad sleeve as much as the draft collar and tube.

I do like the fit of the BA bags in general. I'm 6'5", 230 lbs, and don't prefer to sleep on my back. Even with the bag loaded up with clothes, water bottles, and ski boot liners, there's still plenty of room to move.

I'm considering upgrading to one of their down bags for more compressibility. This one does take up a lot of room in the pack! Overall I'm very satisfied. It's a lot of warmth for the price.

This is the best bag I've ever had. I've been hiking/camping since I was a wee lad and have used every kind of bag from the square flannel style to super fluffy down and this one by far is the most comfortable, warmest I've used. I'm a fairly large fellow and have always had an issue with either my shoulders sticking out or feeling cramped and claustrophobic. I can get my entire body almost including my head inside and I still have room to kick my feet around. I haven't gotten it down to 0 degrees yet but have gotten it down to about 35 and had to acutally unzip it a little to cool off at one point. I absolutely love the pocket for the sleep pad. I was a little unsure about this feature at first but don't ever want to worry about rolling off my pad again. There is plenty of room in the pocket for two pads as well which is good since this is required for cold weather camping. The only thing I wish this bag had was a little storage pocket for a flashlight, ect..
Overall I think it is a fantastic bag and would highly recommend it to anyone looking for a new sleeping bag.