So far so good. I've only used them once in a real match and at the house practice loading. They are built very well and appear rugged. The only downside I could see is if you had to go prone to shoot a stage. They would dig into you and make it mighty uncomfortable. However, I don't have a lot of waist real estate so doubling up on rounds in a small space on my belt is handy.
Any issues with getting a good grip on the back row of shells? It seems like I would fumble with those.