Expensive But Worth It!
I've had my Theta AR for about 2 months now. I ordered a large and it fits just about perfect. I'm 5'11", 200lbs, 42 chest, 32 waist. It's been great for the late spring, Pacific Northwest creeping damp. I've been reasonably dry through rain and wet snow, even while hiking with a heavy pack. Certainly no drips through the seams. The tunnel-style neck is nice too. Yep. It's expensive. But it's the best jacket I have in the closet right now.
Full disclosure: I have been participating in Gore's MountainTechs product testing program since 2007. Doesn't change my opinion of it, just means the lawyers want me to say that. :)