I've built a few 80%, 22 and 30 caliber. All have produced reliable accurate rifles.
The ar15 stuff came from: https://colfaxtactical.com/ar15.html The receiver is fine, but the jig is not anodized and care must be taken to not cut the FCC pocket into the mag release button hole. I don't know if it's the jig, lower or the combination.
The ar308 came from: 80% Products Both the receiver and jig are great. The jig is anodized and modular and fits the receiver well. No issues machining.
I plan to get a TM upper for my next 30 cal build.