See description above ...
I put 9 because of the power supply 'special.

UTILIZATION

Settings ultra simple, if you have ever used any other distortion.
a manual? why?
...

SOUND QUALITY

This is the most important.
good, it must immediately explain to blueseux / rockers to Dad / metal / popeux & other syrupy that this pedal is not for them!
it is perfect in my opinion to the big nag, but certainly not like trash ... etc.. No, we're talking about huge nag with a huge gain, the fat bass sounds really disgusting, not accurate at all.
The aim is to make a lot of noise rather than a lot of notes ...
it is so for me the music (very) alternative, not very fm.
I forgot: perfect for large strident Feedback pasting your guitar on his amp, gniark gniark.

OVERALL OPINION

My pedal reference for music I do: yucky alternative rock, inspired by ex. Sonic Youth and dEUS, but also simple and dirty.
I also use a little big muff (Electro Harmonix) and an dirtbox (trace elliot), which sounds very different and are indeed not compete.
I bought my turbo rat for about 60 euros OCCAZ. it was a steal in my opinion.
I would do this choice with his eyes closed.