Bass overdrive is tricky. Especially if you just want to kick it in for certain songs or parts of songs. If you use it all the time, it's a lot easier to work around. I've been using a Digitech bass driver for over 5 years. It's versatile - mimics several other pedals, and I can testify that the Tube Screamer and Boss Bass OD tones are very convincing. And it's got a blend knob, which I will not do without. I'm sure there's something better out there, but for the money, the Digitech pretty much does what I need it to do. In the past I've used/tried a big muff, Ibanez Super Tube, Sans Amp, and Sparkle Drive. Digi wins.