I was really concerned for the same reason. It's a fair amount of cash to layout to find you don't like it. Still, after a lot of reading I bought it and I'm very happy with it.
I really didn't know how the IWB holster would feel either. Would be comfortable, bulky, chaffing, heavy, need 'next size up' pants, etc. I've found it to be very comfortable after a few days of wear. Fits in my current pants just fine. No chaffing at all which really surprised me and with the gun belt the heft of a full sized hand gun is minimal.