...What sleeping bag are you guys using ... when in the season is it used...
From approx April to Oct I use a Stormlite Rolling Clouds 500.
From approx October through to April I use an Alpkit SkyHigh 800.
No idea what the stated ratings are for either bag. The Stormlight is just about cool enough in high summer and the Alpkit warm enough for winter. In fact, I've used the Alpkit in outside air temp of -10 (so tent internal temp probably about -6 ish) without feeling cold - I wore thermals and a hat however.