Man, I'm going to go out on a limb and assume that there are probably more QC checks done with the Seekins stuff.
That being said; I've put together 5-6 builds on Aero receiver sets that are run pretty hard out here chasing hogs etc... I don't beat them off of trees intentionally, but they get plenty of use banging around in the SxS, bouncing off of me and other things in the dark. I don't run the rifles as hard as some guys do, but I do run them harder than a lot of guys do.
Never had a parts fitment issue either. Would I use them again? - Well, I just bought an M5 enhanced set with handguard for $350 (it's an ugly color that nobody wanted), so I guess that means that I am confident enough to stick with them.