I play rock pop punk and work as a music producer for many years, I don?t use pedals but straight amp sounds. I got this to use it mainly as a booster occasionally. So I did some tests:
I first tried it on a MOOER LITTLE MONSTER AC, it had a pleasant sound, not something extremely wow in comparison to the distortion sound of my big tube amplifier, but very very fun to play!
Then I tried it on the MARSHALL JCM 2000 DSL50 on the clean channel with the gain pretty low...it was just horrible, like a cheap digital fuzz-distortion pedal (it was good for some stoner stuff though lol). Everything changed when I turned the gain knob up (still on the clean channel at 5-8/10), so I had a soft tube distortion and with the pedal engaged I could get a similar tone to the one from the lead channel of the DSL50! I was very impressed, gave me inspiration to play more riffs and stuff!!
Later on I tried it on an ORANGE TINY TERROR as a tubescreamer style booster, I got some very interesting sounds once again that were fun to play.
My friend who is a fender amp user played it on a good FENDER tube combo and liked it very much being surprised about it.
Lastly I tried it on a LINE6 SPIDER combo but didn?t like it much...(I don?t think any other pedal could have sounded much better on that)
Something else that worths mentioning, is that it has a very good note definition, most distortion/overdrive pedals I?ve played (marshall, boss etc) won?t let you hear the higher strings in a chord if the lower strings are playing, this one lets you hear it all!
So my conclusion is that it plays BEST on tube amps that have already a little bit of tube distortion, or as a tubescreamer style booster before your crunch or distorted sound!
It might be cheap but on a good setup it can sound very expensive, recommended!