I totally felt in love with this thing: you tun it on, you don't want to switch it off.
Ok, it isn't cheap and it provides 'only' two controls... but it's perfect, I don't need anything more, maybe just an overall volume knob to keep the output level constant if engaged/disengaged.
It's one of the 'must have' on my pedalboard, I use it as preamp (always on) with my passive JB (how did I manage the sound without in the past?). With active basses, I engage it like a booster, e.g. for slap or solos.
Sound quality is crazy: it's always pleasant, adding tone and sparkle but never being harsh or muddy, even with both dials at maximum.
Super recommended, especially with passive basses.