These bags will work fine for car camping or for use on cold nights in the backyard or at Black Friday, but are too large and bulky to be worth using for backpacking. The synthetic bags at these weights take up huge amounts of space and are heavy to carry.
I had a couple of the higher end ALPS Mountaineering synthetic bags *(don't remember model name, but the ~$200-$250 retail ones... They were 0-degree bags and I successfully used them down to ~5*F. However, that was with 2-3 insulating layers of clothes, a liner, both foam and insulated air mats, etc.
For general use, I'd say add 20 degrees to the temps of these bags if you're a male, 30 if you're a female (for camping purposes, assume women sleep 5-10 degrees colder than men under the same temps).
Also, for anything below ~40*F, your sleeping pad will make a tremendous amount of difference. If you're in a -20*F bag on icy ground will still be freezing unless you have enough R-value in your sleeping pad to keep you from losing heat to the ground.
Sleeping bags work by trapping air warmed by body heat... the insulation on the underside of a sleeping bag is compressed by your weight and therefore the compressed insulation doesn't trap much warm air and doesn't keep you warm. You need a good sleeping pad for cold temps.
These are a good deal IF they meet your needs -- otherwise you're just throwing money away... and filling your closet with stuff you won't use.
I totally agree with this advice, and I have owned a lot of bags in the past....
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