I have an Invictus Practical DeTurk vest. I was happy to get the weight and bulk of caddies off of my belt, but some serious competitors are using belt mounted quad load caddies so it is really a preference thing.
I had some of the older Taccom caddies at one point and didn't care for them. But he has upgraded and improved his design and many seem to like them a lot.
I can't imagine trying to shoot from some of the awkward crouched or prone positions with quad load caddies on my belt, I used to go prone on my AP Custom 4x4s and they were always rock solid but I have seen guys prone out on all manner of quad load caddies and come up missing half their shotgun shells.
If you are shooting 3-gun nation stuff that doesn't really matter, because it is a standing/moving drag race with fewer props and no long range rifle. Different gear requirements for outlaw type matches.
Same kind of thing that finally pushed me towards a holster with retention. Saw too many people go home because of a dropped pistol in a game where saving a tenth of a second on a pistol draw is of very marginal benefit.