aesery wrote a review of Mountain Hardwear Flip Sleeping Bag: 35/50 Degree Synthetic on April 27, 2011
I was truly skeptical about this bag, especially since I'd been burned by 'innovative' sleeping bag designs in the past. I decided to throw caution to the wind and replace a sleeping bag that was twice what the Flip cost(but had a big elastic hole in the back...). I just got back from an early Spring trip out to the Olympics and can attest to the Flip's versatility.
I started out the evening covered by the 50 degree side and sleeping on the 35 degree side. When the temperature dropped to almost-freezing, I turned the bag over (still skeptical) and slept like a baby for the remainder of the night. The second night was at a higher altitude and still I was adequately warm in just long johns! You won't be disappointed by this bag (which, BTW, is great for using as a blanket if you or your partner tends to sleep at a different comfort level than you do and you want to snuggle).
There's more than enough leg room (in fact, I had my pants rolled up in the bottom AND a stuffsack with an 8oz fuel canister), a handy pocket on the 35 degree side, and a relatively snag-free zipper. I'd like to buy a compression sack because I know it can pack down smaller.