Ben wrote a review of Sierra Designs Utopia Sleeping Bag: 30 Degree Synthetic on September 25, 2013
Familiarity: I've used it once or twice and have initial impressions
I tried this bag out on a very rainy overnight hike recently, I didn't tuck in my tent's ground cloth (accidentally) so I ended up with a puddle by my feet. Overall the bag was warm, I believe it got to the mid 40's (F). It works, it is light weight and it is relatively cheap.