For one I would guess it be a better build than any unit made by behringer. Yes the ep 2500 4000 etc is there biggest reliable bread and butter but the rest just does not measure up. I had a dbx driverack pa plus and discontinued its use because the third output, WOULD NOT DO SUBWOOFER. It sounded like crap. The first two outputs would do acceptable subwoofer.
The DBX driverack also had ground problems that did not exist with my dbx 3 way crossover i was replacing as an upgrade. When i bought the Bunker unit, the grounding problems went away!!!
So DBX i do not think is internally built well, at least not the driverack Pa. I would be scared to buy behringer as I know most of their processing units go belly up too soon for my tastes.
Seeing as the Bunker BPD 1 does the job nicely with no issues and top quality internals, I am sticking with it. I like that it is NAFTA produced also.
I do not care much for the usb connectivity of the bunker plus unit. You can actually download the software and run it without the unit attached. It is just a convienience thing if you make a lot of changes.
A Good amplifier requires a adequate power supply, It does not matter what the amplifier is capable of if the power supply will not provide the power required. Most amplifiers have under rated power supplies. It is up to you to make sure you get the ones that are least under rated if at all.