At first it was just a theoretical failure point. I told myself to get over it. Then, it failed on me. I had traind with 120 pounds in the pack and no isuues, but on a really wet hunt my partners K3 belt came apart around day 3. We tied it together with 550 cord as it would no longer hold for more than a half mile or so. I thought this was just a fluke with his pack. His camp was about 15 pounds heavier than mine. When I loaded mine up with meat (about 100-120 pounds in all) my belt came apart.
Exo replaced the belts without question and said it is really rare to have a failure. They even made a custome belt for me with more velcro as I was not comfortable with trying the same thing again.
The fix with 550 cord worked well and is easy to do in the field. So I nor my hunting partner feel it is a deal breaker. However, I would prefer a one piece belt just to eliminate the possibility of failure.
Personally, I thing the endless wetness and dirt in South East AK was a major contributer to the failure as nothing dried out the entire hunt and at numerous spots we had to crawl or slide to make headway. Both of us had put in a lot of training with the packs and the belts worked well until after a couple days of that crap.