Great 2.5 season bag!
- Familiarity: I've used it several times
This is a reasonably priced (because you can regularly find it on sale for 10~20% off) and a very versatile sleeping bag that you can use as a 3 season bag if you sleep cold.
I've used it down to low 30s in just base layers at Shenandoah in November last year with Thermarest Trekker with a relatively low R-value of 2.0; I won't say I stayed warm, I felt cold during the night, but it wasn't horrible either. I'm 5'11", 170~180lbs (depends on the season), circumference around my shoulders (so the widest part of my body) is about 47", and the regular fits me very well in that it keeps in the heat well yet it leaves me enough room inside so that I don't feel cramped. The Pertex inner lining is silky smooth to touch.
The bad (minor):
My regular WITH the stuff sack weighs 22.7 oz (the stuff sack is 0.6 oz), so mine weighs about an ounce more than it's listed. The zipper can get caught at times despite the zipper guards, so that's the only minor complaint that I have.
Overall, a very solid 2/3 season bag (depending on how cold you sleep), and can compress very small if you like to pack light for your trips.