I tried the Markbass Mini distortion pedal today. It sounds like your run of the mill tube screamer. Nothing special, which is disappointing since there are a good dozen pedal sounding pretty much the same. It's best attribute is its size but don't count on hearing something new and different.
It sounds like a Fulltone Bass-Drive, Homebrew Electronics Hematoma, Xotic BB preamp, Badder Monkey, Polish Love, Pigtronix Fat Drive....
I noted that the 9 volt plug is a little too deep on this pedal. You need an adapter with a long male plug otherwise the pedal does not power up. The highs and bass tone controls are labeled as tone and tone. High in on the left and bass is right. Why not label correctly?
It's no big deal but it's kind of strange. The construction of the pedal is very good, it's made of thick metal and it's made to step on despite the small size.
Markbass has put out many innovative if not ground breaking products. Their large footprint pedals have generally been interesting. Their Compressore for example is a superb tone machine. It seems that the only innovation here is the small size. There are hundreds of pedals coming to market but it seems manufacturers have been busy trying to compete for market share with Boss and MXR rather than coming out with innovative products and new circuit designs.