We have a Pearl E-Pro live electronic drum set. I understand, though it's not officially announced, that the E-Pro brain is a DM10 with different case.
We tried using the Pearl brain for several months and the four output thing was just not workable for us in live worship. We had a Roland TD-10 from a previous electronic set and that has been a much better solution for us.
The Pearl brain didn't have as many sounds or adjustments for the sounds as the TD-10 does. I don't recall it sounding "bad"; it worked fine as electronic drum brains go, but the outputs and adjustability were not there for our live work.
I do not think the outputs are balanced. We used four DI boxes with the Pearl brain and I bought two four-channel DI units for use with the TD-10.
If you're using it for practice or recording, then maybe the four outputs will be sufficient, maybe even two outputs would be fine. I would suggest using DIs with the DM10.
Jeremy Johnston
Technical Ministries
Christian Center, Kalispell