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I made the switch this fall and it changed my idea of comfort. I did a bunch of hiking/backpacking as well as stand hunting. I personally have First Lite and it fits really well, but I'm tall and fairly skinny.
The main change for me was that my crotch and armpits don't get swamped when doing serious work with a backpack. And if they do get a little sweaty, they dried out in just a few minutes. I went with the AeroWool base layers and they literally are comfy enough for me not to want to take them off. I'm talking even after a week of not washing them. They do a decent job of keeping you warm and will do just fine underneath some windproof pants and a decent shell if you'll be moving. If you're looking for something that will be good for a long sit in 20 degree weather, you'll probably have to get something that is a thicker fabric, but wool would work just fine.
My setup is as follows:
Top - Minaret Aerowool top, Chama hoodie, and Uncompagre jacket (not wool but still excellent)
Base - Dobson Aerowool boxers, Glenbrook 3/4 length Aerowool bottoms, Corrugate guide pants (also not wool but excellent)
I have really love Smartwool socks and will continue to buy those and I'm sure that their other base layers are comparable to the FL stuff.
If you have any questions at all feel free to PM me. The switch was fairly expensive but I feel as though it was worth it.
The main change for me was that my crotch and armpits don't get swamped when doing serious work with a backpack. And if they do get a little sweaty, they dried out in just a few minutes.