I only have one. It has been just as nice as my Stag, and Spikes Tactical lowers as far as fit goes. The finish on mine is a bit rougher in texture than the others, but I have heard that this may have changed since I bought mine. It is still a nice dark, thick and even finish, and functionally it is just as nice as any of the others.
A Couple of noteable differences are:
-the front takedown pin detent hole is drilled a bit deeper than most other lowers. This makes installation of the front takedown pin/detent/spring a touch easier than it was on the other lowers. It still functions just as well but makes assmebly so much nicer.
-The lower is also drilled and tapped for a screw to adjust the trigger take-up. This is an additonal feature that you may or may not be interested in, but it's there.