I bought this not because I'm a fan of that heavily overdriven bass sound but purely because I thought I should have some kind of overdrive available on my board.
All the controls work absolutely perfectly and although plastic it actually feels fairly bomb-proof. My problem is the sound of the overdrive effect itself. First off, as soon as you turn the drive knob 1mm you are in at the deep end with no gentle introduction for those who might want just a little extra drive to their bass. If you turn the knob any further you are into some really seriously heavy distortion! Secondly, the sound is not particularly smooth and growling but is more of a sharp rasp! The balance (blend) control works well but you still have that harsh sharp sound in the background. The only way I have personally found a decent sound so far is to turn down most of the mids and top end which leaves it sounding slightly muddy but a little smoother.
Don't get me wrong, for a budget pedal it's absolutely fine but in reality it's a full on BASS DISTORTION PEDAL and for something like thrash or serious heavy metal, it's probably fine. If you want a little extra warm smooth drive on your bass look elsewhere, though you will probably need to pay a lot more.
I now have a fair collection of Behringer pedals and 9 times out of 10 can honestly say that they don't disappoint in any way at all. This one sadly doesn't do what I expected of it and should maybe be re-labelled as a 'Bass Distortion'.
It will stay on my board for now and I am in no big rush to change it, but if I win the lottery in the future, I will be looking for something else with a warmer creamier overdrive!