I have no doubts the Larue is top notch.
The Burris (#410344) is QD as well, and claims to return to zero too. Like I said, they are very similar, which is why I was wondering how the quality compares. Has anybody used both?
http://www.burrisoptics.com/arpepr.html
Hopefully, someone with direct experience will chime in, but just looking at the two mounts, I can see a few significant differences.
1. Of course, the PEPR features rails at the top of each ring. If you like that, the PEPR is the way to go. If you don't plan on mounting anything on top of your rings, that's added bulk and edges you don't really need.
2. It appears that the PEPR requires to you balance the torque among six bolts on each ring while trying not to rotate the scope. For the LT104, you cinch down the base bolts before leveling your reticle, leaving you with only two diagonally-opposed bolts on each ring to tighten.
3. I can't tell if the rings lock into each other like on the LaRue, but the LT104's threaded inserts save a lot of grief (either lapping or being very, very careful with alignment of the rings) when mounting a scope.
4. The QD system on the PEPR clamps from the sides and requires you to balance the tension of both levers to have full and parallel contact with one entire side of the rail. The LT104 can actually be run with only one lever locked and it will still have full engagement of the rail on both sides.
The PEPR might be worth every penny, but on paper, it does seem you get a lot for the extra $40 (retail) you'd spend to get the LT104. I do know that I've seen several satisfied reports from those that sold their PEPRs to get LT104s.
Hopefully, someone who has/had both will be along shortly to give the straight skinny.