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Last year I put around 1500 rounds thru it. I just got done tumbling all the brass from last year. That might not be a lot to some people but for me it was a good year with no issues. I like it that's all I can say, and it eats anything I throw at including wolf.
What kind of round count. Try pushing about 1-3k rounds through it in 1 single weekend and then come and tell me how it responds. I have put over 500rnds through my last BCM upper as fast as I could swap mags with 0 FTE/FTF etc.
Del-ton is fine for a range gun that may see a couple hundred rounds over the year, but is in no way or shape in the same class as DD, LMT's, BCM's etc that are made to take thousands of rounds over the course of a year.
It depends, though. There's not much on an upper receiver group to fail other than the BCG. I have a Model 1 upper receiver group (with an LMT BCG) that has a few thousand rounds through it and the only failures can be attributed to crappy Tula ammo (same problem with several other rifles including a Colt upper and a YHM upper). I wouldn't hesitate it to bring it to a three-day class, although I can't ever see myself spending the money for such a class.
With that said, I'll be making some purchases when I leave MA - my next rifle will either be built around a BCM upper group, or maybe a 6920.