I absolutely love my First Lite gear, it's the only stuff that will touch my skin actually (except for Darn Tough merino socks). However, I recently stopped by the Kuiu store in CA on my way up to the mountains and tried on some Attacks. I looked them over, tried them on, and there was no way I was leaving without them. They are, without a doubt, the nicest mountain pant I've ever tried on. Plus the Major Brown color is perfect (I'm an earth tones guy over camo). They performed well in the field, that's for sure. I doubt I'll ever wear another pant unless it's hot (>mid 70s). Wearing merino underwear avoids any clammyness if it's semi-warm (but if it's HOT hot i'd wear my Prana climbing pants...).
I own two pieces of Kuiu gear: the bino harness and the attack pant. They are both phenomenal. I am partial to First Lite for most things, but I can endorse the hell out of these two Kuiu items.