I bought a 20'' hbar upper from them during their Black Friday sale.
I was shooting with some 40 grain handloads and the accuracy is fantastic. I'm a cruddy shooter, but at 50 yards, I put 13 rounds through a hole that was 3/4'' at the widest part.
Quality wise, everything works flawlessly. It gets the job done, and gets it done really well. They make an excellent product for the money, and that's what everyone has said.
I have about 1,000 rounds through mine so far, and it works really well. I tried some cheap tula ammo when I first got it to see if it would even work, and it had feeding problems. I'm tempted to try again, just to see if it'll work, but handloads seem to be working excellent.
Buy one, you won't regret it. It's a super great value for the money, and I'm satisfied on how well it works.