I purchased one back in March, Revelation X- 6' reg with the 30% overfill for the 30 degree ( 20 oz) and used a silk liner to keep the inside clean.
I used a 8L WP bag to stuff mine in worked perfect.

Tried it out on 2 trips this season.

Wore a light fabric Balacava, T-shirt & hiking pants & use a 3/4 Z-lite pad. One trip was just 40 degrees and the other was down to 24 degrees. Note : I use a Tarptent Squall 2

Determine if you are a cold or warm sleeper when choosing!

Will not got back to a bag again for 3 season camping

Mike