Dog hit a homer with his post - see my "like it" tag.
DPMS is one of two AR-10 platforms and Armalite is the other. Dog is 100% correct that they don't play well together like on the AR-15.
So are you asking about the platform itself as opposed to an assembled rifle from DPMS?
If so, I think that both the DPMS platform and the Armalite platform will be well supported as the AR-10 becomes more and more prevalent as a weapon of choice for the civilian populace.
I have held in my hands both the Armalite and the DPMS configurations for the AR-10 and they are both what you would expect. It's a receiver, just like other receivers.
If you put quality parts on it, it will shoot. If you half ass it, it will half ass you back in performance.
I'd love to know your plans. Are you building? Or purchasing outright?