I have the iwb and other than the wait while they make it I have no problems with it. Comparable to much more expensive holsters like the Crossbreed, etc.
If you change guns you can swap the shell for one that fits your new gun. For free...kinda.
Did you get the original one, or the newer model that is softer?
A few months ago I got one of the originals after hearing so much about how great they were. I sent mine back, it was basically like wearing a piece of plywood......uncomfortable. I may try one of the gen2's with the neoprene now.....I'll give it a fair chance.