I much prefer this bag over traditional sleeping bags for summer camping. Regular sleeping bags are too uncomfortable when the weather is warm and humid. Fleece is just a great fabric - easy to clean, quick to dry if gets wet, and more comfortble for warmer or humid weather (and keeps you warm when it is cool).
Just bought this for a three night trip to Yosemite. Averaged about 60 degrees per night, so this was perfect. I also anticipate using this as a liner to make my other bag warmer for when we camp at higher elevations further north to make them warmer. Well constructed, fuzzy and warm.