I use Milt Sparks IWBs and have for 30 years. Still have not worn one out, in spite of lots of use.
I have multiple different example such as the Versa Max, Summer Specials, and a couple I don't recall the names. They all work well, but I find myself using and preferential to the old school Summer Special versions.
I even picked one up for a 4" N Frame .44, which works rather well if you wear the proper pants and belt.
This one is from 1991:
The punchline is that they are excellent holsters, worth waiting a little longer for, since they will last longer than you will. If you are really going to carry a gun for hours on end, day after day, spending a little extra and getting a great holster instead of a mediocre one is a very smart thing to do. Otherwise it will end up in a box and you be back to looking at holsters in a few months.