I've had this unit for a few weeks. I use it for rehearsal and gigs whenever I need to travel light. It is so small fits in any bass bag.
It has everything I need and nothing more : tuner, compressor, preamp and chorus. All effects sound OK, especially considering the price and size.
The unit is well built and feels sturdy. It might have been a good idea to protect the little knobs from the foot switches - but again, at this price point...
I also own the Valeton Dapper Bass, which is a bit bigger and has a couple more effects. Only good things to say about it after a few years of use....
But what attracted me in the Valeton Dapper Bass Mini is its extreme portability. Very happy with the Mini so far :-) I actually don't use the bigger one that much any more.