My friend is a doctor and he can afford the best, I drool over all his gear and toys. He's still thrifty though so he buys top-quality stuff that performs, doesn't just buy for the name/look. He sheep hunts with his whole family and carries some big loads. Took a stone with his bow last year and hunted Tahr in New Zealand a couple of times last year alone. HE USES A KUIU PACK and it does what he asks. He hasn't tried a new pack because the kuiu is working great for him. His wife uses a KUIU pack as well. Far from a fanboy as I don't think he has any KUIU clothing.
I, on the other hand, bought a Kifaru, buy once cry once attitude. I can't afford to take a loss and just upgrade or try something new. I wanted to know that I was getting a high performing pack.
When I read reviews from guys that have used many packs, KUIU doesn't fare so well. I think you can be happy with Kuiu it's just that there are better options.