This bag is ridiculously spacious, and if you have good sleeping pads, you won't miss your bed. It's a tad bulky; I've taken it backpacking before and it works if comfort is your priority for that trip. I usually use a Gregory Z55 and the bag needs to be stored vertically in the pack instead of stuffing it down horizontally into the sleeping bag spot. That being said, it is probably the only two person bag you could viably take backpacking, which is pretty sweet. It has two pillow pockets - hardly a necessity but the GF loves them. REI basecamp pillows or Medium Therm-a-rest compressible ones fit great.
I do not think it lives up to its temperature rating. Both of us started getting chilly in the mid 30's using Therm-a-rest Traillite and Basecamp pads. The Basecamp pad is pretty thick and warm (R-value 5), so I don't think warmth issues were related to inadequate underside insulation and are instead a shortfall of the bag. I have also used 78 inch inflatable mummy pads inside the bag's pad sleeves - they work fine and just stick out the top a little. Fits perfectly in a large Sea to Summit Event compression sack.