I had one as well, I only wanted DBM so I could quickly unload my rifle during Antelope hunts (getting in and out of my Jeep). The pro is the system bolts right into your stock. The con is they are a pain in the ass to load, really. At the range I just ended up single loading the rifle anyway, so its real purpose was for hunting. Also they are single stack so the mag sticks down pretty far, the 10 round is simply ridiculous. If you want a no smith type DBM look for an HS precision, the older one sat about flush with the bottom , the newer sticks down a little. They are 3 rounds, I believe.
Other than that, go with an AI type, i/e CDI, Badger, PTG...