i have oened two dpms products, and m4gery upper, and a preban lower. the upper was jam-o-matic with any mag put through it. the lower was good quality, a little bit loose, but a good lower.
my bushmaster experience has been better. the above mentioned lower had a bushmaster upper on it which functioned flawlessly and was surprisingly accurate for the configuration. i also have a bushy dissipator in the owrks and one in the safe that i havent shot yet, but they fit well and finish is great.
overall, especially when you throw in their AWESOME customer service, i would go bushmaster for just about anything. i am sure that my DPMS experience (jam-o-matic) isnt typical of DPMS, but it left a bad taste in my mouth as a first experience with their product.
go bushmaster, you wont be sorry...