I bought this because I want to use it while car camping, and it's great for that. When you first open it, it seems flat, but after a few minutes, it fluffed up nicely. I used it as my nightly pillow for a week, and it worked well. The medium size, unfortunately, is a little too big to fit comfortably into my mummy sleeping bag, but that's not a big issue for me.
This review was written in the old system and had content requirements that are different than reviews written today.