I recieved my MTAC today!
I ordered my MTAC holster with J clips last Thursday, and it came in the mail today. First off I'd like to say that Comp-Tac has very fast shipping.
Ok, onto the review...
The MTAC holster IMO is a well constructed holster, and it did take me a few tries to get my G19 into it, but after a few minor adjustments to the retention, I got it where I wanted it. I find it to be quite comfortable. The thing I don't like about the J clips is they don't always stay on the bottom edge of the belt like they're supposed to. I should have ordered the standard clips, but that's the next thing I'm going to do. My gun still prints a little bit towards the bottom of the grip, but not as much as it did with my Blackhawk Serpa. I tried tucking in my shirt, and experienced some difficulty, but once I got it, you couldn't tell I had a gun on me, unless you knew what to look for, which most people don't even pay attention. Anyway, overall I'm glad I bought one, and would recommend it to anyone looking for a tuckable IWB holster.
Sorry for the bad quality pictures.