I have the AlienGear - exactly (and I mean exactly) like the Old Faithful model but about $10.00 cheaper and assembled.
The AlienGear is very comfortable and allows the gun to set a little deeper which makes it easy to conceal. It is tuckable but a little awkward to get tucked just right. Practice does help.
I also have a Blade-Tech Revolution that came with the M&P Range kit. I don't like the way the gun sits with the belt attachment...grip heal sticks out too far and wobbles. I bought a Paddle attachment accessory but it didn't help much. So I ordered a Gould 3-slot pancake OWB and DeSantis Sof-tuck IWB (should arrive Fri 4/11). I'm on my way to a box of holsters
I keep going back to the AlienGear - it is my favorite.
Enjoy your search.