"
And Brian- I am looking at the Montbell Therma wrap too- do you already have it? Is it comfortable and warm enough?"
Yes to all of the above, with the huge caveat that what's warm enough for one person isn't for another. For the weight, however, my ~2-3 year old Thermawrap jacket is a great piece of kit. Note that sizes tend to run a little small; in thru-hiking condition size medium fits me fine, it's a bit more snug when I'm in city-fat condition (like now), but still fits. In general, I'd suggest sizing it up from "normal", however.
For 3-season hiking the Thermawrap jacket is all I use, but I don't tend to hang around in camp (toasting marshmellows or whatever) --- if it's on the colder side in spring or fall, I crawl into the sleeping bag.
I guess another data point is that I never try to hike in the Thermawrap, even for a short time, or at least it would have to be bloody cold before I'd try. But I tend to "run hot", YMMV a lot.
But don't rely on just my comments, it's easy to find reviews online, such as at
http://www.backpackgeartest.org/revi...wrap%20Jacket/