So my original review looks like it got censored by Thomann, like pretty much every time I give a product a bad review here. Shame on you Thomann!
Anyway, I'll try again:
The hole in the chassis for the power cable didn't line up with the socket for the power cable, making it impossible to actually insert a power cable.
This would normally have been a relatively easy fix. I removed the circuit boards from the chassis, widened the hole in the chassis with a round file, no problem.
However, when I re-assembled the pedal the toggle switch broke. I work at a guitar/electronics workshop so I have lots of experience with this type of toggle switch. I did not tighten it too hard. I just barely tightened it and the whole switch just fell apart.
The tone, when tested with a battery before it broke, was ok for the price.
Very poor quality pedal, definitely not recommended.