I have (or have had) a few behringer pedals - most have been pretty good, but the tuner pedal was crap for bass. The BDI is great for adding a bit of a snarl to the bass, but the ADI-21 (the brown acoustic equivalent to the BDI) really warms up an electric upright bass - it sounded wonderful when I had my old Dean Pace, and I still use it with my NS-CR5M
I often see criticism of the build quality of behringer pedals - particularly the plastic housing, but I've never had any problems with mine. My ancient BDI-21 looks a bit battered and abused but still works perfectly. Out of interest anyone actually ever had a behringer pedal's housing disintegrate underfoot?