I feel like for the money KDG is asking, I'd rather go with a LaRue or Bobro.
To me, there's basically three pricing tiers for QD mounts:
$0-$100: UTG QD mount. Shockingly, this mount does not suck, and I don't think the PEPR QD justifies the price difference.
$100-$200: ADM mounts (Recon or Scout). Never had a problem with either.
$200+: LaRue or Bobro. I'm actually a little meh on LaRue due to rail compatibility issues (you're not supposed to use them on rails with the middle lightening slot), but they're good stuff otherwise. Bobro is famous for the best RTZ available.