I have no experience with the DPMS AR-15s
I do have a DPMS LR308 AP4 Carbine that i've had at least 8 years now and the rifle has always been very accurate,specially for a 16" barrel,i'm sure it's not in the same class as some of the custom upper tier rifles. I have 2 Colt AR-15s and comparing the three rifles the DPMS looks just as nice as the Colts.
I agree with the triggers,my trigger was a bit gritty but did smooth out during break in.
JMO A 600.00 DPMS should be a good rifle for the range,plinking around,and any other needs.