I was looking for an overdrive pedal for my P Bass. I had been using a Way Huge Electronics Fat Sandwich, which is a guitar distortion pedal and whilst I got interesting sounds with it (heavy saturation), it's not a bass pedal and I was definitely losing some bass frequencies.
The price was definitely an important factor for me. I didn't want to fork out too much. The Blend knob is great and essential for me. It allows you to retain as much or as little of the original bass sound as you like. You can then play with the 'drive' and 'treble' knobs to find the overdrive setting you like (volume knob controls overall output volume). The more you crank the treble, the more the signal is overdriven. The treble also acts like a tone knob I guess. There's a lot of different sounds you can achieve by playing around with different knob configurations, so quite versatile really. The 10db attenuation switch is also handy for active basses, or if you just want to lower the input of your passive bass.
So far, I have only used this at home on my EBS Session 60 combo, so I've yet to try it out on a larger amp & cab. It's definitely a useful and versatile pedal and good value for the price. The include power adapter is of course also handy. I was also considering the Catalina Bread SFT pedal, but that doesn't have a blend knob, so I went with this and so far I'm happy with it.