The spec of this pedal ticked a lot of boxes for me. I love the fact that it has an expression pedal output which means I can use it for volume swells AND gently boosting gain (which works well going into a EBS Valvedrive for a gradual build up of dirt). It's built like a tank and has a quite funky appearance. The controls are high quality with a smooth action. Unlike other boosts, it has quite a subtle overall boost so it may not be for everyone.
The sound is great though, it adds a nice colour to my bass, both in the bass and treble regions and is useful for also cutting treble if you want an old school sound mid-song. The gain is the main control for me, adding boost of volume or a mild warmth - the expression pedal adds more gain and I'd almost say it's a requirement to get the most of this pedal. I'm still playing with this and it will be interesting to see how it works through other dirt pedals as well as a markbass super synth.
My one gripe is the rubber feet make it slightly more difficult to fix it to a pedalboard; I use an additional piece of thin IKEA plastic chopping board cut to size with velcro on both sides to raise the pedal high enough so the feet don't get in the way - works well but is an annoying work-around in this day and age.
Based on it so far, I'm very tempted to try the MF Drive too (and I already have a few dirt pedals). I've given it four stars for now, but may bump it five in a few weeks.
Edit: bumped it up to five stars. It's great for pushing the valve drive from warm to hair with an expression pedal. It also adds some magic to the base bass tone. Edit 2: I'm loving this pedal the more I use it. The two circuits offer a nice variety from clean boost to some slight hair but I'm finding I use it more and more to create amazing volume swells (with a delay pedal) to get simulated arco sound. Wouldn't be without it now. :)
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