Fair enough...I have an older JMCK Wing AIWB holster for my Colt Combat Unit and I haven't had any issues with it, especially with regards to retention, etc...I only wish I had though a bit ahead and gotten it with loops or something, and not with the single big belt clip. The holster's undergone a few revisions at JMCK since then, now they're at the 2 and 2.5, and I prefer the 2/2.5 over the earlier versions...
But, I didn't really look at getting an AIWB holster that was easy to put on/take off. Mag carriers, yeah...holsters, I just went with pull-the-dots ever since. Easy/fast enough to take off, I guess?
The big single clip is really easy to slip on/off...too easy; a couple of times I caught the clip just barely holding onto my belt. I doubt the holster would have come out with the gun, but...there's always that "but".