I know you said you are getting a boss unit but if you dont like it, check out the one i got:
HardWire CM-2 Tube Overdrive Overview
The thing i like about it is the separate bass AND treble control. As srxplayer said you can lose a lot of low end. With this pedal you can compensate for that by boosting the the lows and dropping back on the highs. That was a big factor for me since i was never a distortion on bass fan due to the low end drop.