I have pretty much everything they make. I've been collecting it since they opened.
I have the 1850 carbon frame pack and I love it. I put a camelback 100 oz bladder in it. Lots of water but hunting early season blacktails the temps are over 100 so we go through most of it in a day. My pack is normally around 23 or so pounds and I have used it to pack a boned out hog and it performed great.
I also sold my Sitka gear
once I started using the Kuiu. The biggest difference I noticed between the two was breathability. No comparison. I was sweating like a pig in Sitka
and almost no sweat in Kuiu.
You won't be sorry with any Kuiu purchases.