I just sold one to my shooting buddy. I had zero problems with it, but I didn't really shoot it much.
I only sold it because I bought a 24" barrel varmint version and really didn't need it anymore.
I had the flat top 16" model, bought it back in 2009. Telescoping stock, flash suppressor, and a "gasp" bayonet lug!
Had I not bought the varmint AR, I would have had no problems keeping the Del Ton and shooting it. The only real complaints I've heard on the net come from guys who say they use it every day for their work, LEO, security, etc. They're not fond of anything less than a Colt, Noveske, etc.
Since I don't use mine in that fashion, I'll never know if they're right.