I bought mine used from a good freind, and I've used it some... I hate to say it, but the pack stays are starting to come out he bottom of the bag, which seems to be something that tends to happen.
No big deal, Kifaru said they'd be happy to fix it, and its not the type of failure that just pops up (it takes time and abuse) When I get it back, it's going to be a hard decision between keeping it, or ordering a Timberline (not the new Duplex one) and selling off the KU5200.
Kifaru makes great gear, and they are super people to deal with. I'm not your average backpacking hunter, and I know I abuse stuff.