You can lump me in the Kuiu supporter family as a reluctant participant and with exceptions. As a backpack hunter, weight is always a massive priority. Kuiu seems to consistently beat FL and Sitka on that front with their clothing. Being an Idahoan, I would love to see FL make stuff that I want, but they just don't cut it for me. Kuiu somehow manages to nail the weight to toughness ratio right.
The attack pants are legendary and hip vents are a dream! If you have an athletic build, Kuiu will fit great. For some bigger guys, it's a nightmare. I'm 6'2 and 180, and Kuiu is, hands down, the best fit for me. Everything else seems to be built for the "American average" body habitus. Sizing is set up for layering. I am on the border between L and XL with shirts and am consistently XL with KUIU tops. Waist measurements are consistent with everything else I wear.
If you get their down, go all the way with Super-down as the lighter jackets just don't cut it on fill. The shell material is pretty thin and frail, but I don't find myself hiking with my down layers. They use high quality down with water treatment. It completely destroys FirstLite's down. My one FL jacket fits like a football jersey with short sleeves and room for 2 inside. I've committed to using it until it is perforated beyond repair, but will be eagerly waiting to upgrade to superdown when the time comes. I have their down zipoff pants for glassing and would recommend them to anybody who hunts open country. They can be a lifesaver on a cold night riding through a snowstorm in a 3 season tent as well.
The Yukon gaiters are second to none. Having used Kennetrek and Outdoor Research, I still give Kuiu the edge. Velcro entry, no sagging, slipping, good protection from ground moisture, lightweight and quiet.
On camo, I have long been in the camp that it is more about marketing hype than practical. Lately, I have adapted slightly as it can tip the scales in your favor, buying you vital seconds and decreasing the distance you can be detected from. Being liberal, I might say it gives you an advantage 5% of the time rifle hunting. With human eyes in open country, I can always pick out my buddies wearing solids faster than those wearing camo. Kuiu Vias looks like vomit on Desert Storm camo, but it is one of the best performing patterns in open country country and moderate timber coverage. I've seen Sitka work like magic, but I can't handle the weight and bulkiness of their gear for my style of backcountry hunting. Light patterns always seem to perform better in every environment as the biggest giveaway is the side of a person opposite of the sun (but not necessarily skylined). This is another gripe I have with FL. Companies need to stop putting so much GREEN in camo.
*Kuiu cons and gripes:
For the last 5 years I've used a KUIU 7200 pack and I'm over it. Will be going with a Mystery Ranch Beartooth after wearing just about every $600+ pack out there. The KUIU pack has served me well, but the extremely narrow frame is a major pain when packing out animals. Heavy loads tend to shift on the frame a lot- imagine trying to keep a load tethered to a skinny pole without spinning, it's impossible. The original Kuiu pack frame was wider and had a load shelf. They really screwed up trying to get more Gucci with a narrow frame and without an integrated load shelf. I will keep the smaller, 3200 bag for day trips and summer mountaineering trips.
Every time I take the pack off, it wants to fall over which really can be a pain. Mystery ranch bags have flatter bottoms and seem to be the only pack out there without this problem. Any time I need to get something out, I find myself having to undo all the compression straps. Access is average at best. The load cell on top is poorly designed and wants to slip off. I took mine off and converted the pack to a roll-top.
I've been on the phone with Kuiu customer service who have always sent me hardware for sewing projects and repairs free of charge. I get the vibe that they really don't want to listen to constructive criticism. I have had the exact OPPOSITE experience with First Lite, who will happily talk your ear off on the phone.
As far as buying American made hunting gear, I would absolutely love to. I've yet to try on anything that fits me and matches my style. Maybe some day, we'll get smart about not outsourcing pollution to our neighbors for cheap labor. It's just too hard for companies to compete. For now, I guess you can call me a disgruntled Kuiu supporter.