I used a Kuiu Ultra 6000(sometimes 3000) bag for 2 years guiding.
Was very nice until it failed. Customer service was pretty good.
For mainly day hunting they are pretty good, they are very light and compress very well
I prefer the Ultra bag lay out to the Icons as it is just more simple to use, they have made the fabric thicker(500d) since I have had my Ultra.
My guide runs one with out issue so far.
For more casual use/day hunts I think they should last pretty well.
My main issue with the set up was the poor attachment of the bag to the frame. We would often have the bag 'lift' off the frame, this was mainly happening when using the 6000 as a day bag. Annoying but not a real major.
The failures I have had are the way the shoulder straps fit into the frame, these are small plastic 'buttons' that are set into the shoulder harness foam. Not overly strong and I do not trust the system much after seeing it fail.
I think this varies on what 'height' you have the shoulder straps set on and how you shoulder the pack, I know I will break one again(as Ive broke two) but I know guys that have used them for a quite a long time with no issues
Bomb shell- my Kuiu lasted longer than my Kifaru before failing, so it goes to show that no matter what you have it can and will break. (both companies had good customer service from my end, the Kifaru was easily repaired, the Kuiu was not able to be fixed due to the way they are made and needed replacement)
PS-I have 'hated' on kuiu a bit after having them fail in the field, its not nice having any gear break when you rely on it, but in the last couple of seasons I have seen nearly every brand and type of gear fail in one way or another,
