I bought this pedal as I do not own a valve amp and the reviews of the joyo version of this seemed very positive.
I was surprised how versatile this pedal was, with control knobs for bass, middle, treble, as well as volume gain and voice, the voice control when used with gain has a great deal of versatility and even small tweaks can change the sound dramatically.
When used with a transistor amp, in my case a Fender 65 dsp, its like a different amp altogether, smoother tones, especially from gain/voice control, you just have to tweak the amp controls along with pedal controls tofind the sound your looking for.
However, this particular amp has an effects in/out loop, so when this pedal is plugged directly into effects loop and guitar plugged into pedal, its just like using the amp as a stand alone cab, as the guitar is not going through any of the amps build in effects/controls, its just using the ac tone pedal for everything, giving you much more control when tweaking the knobs to find your sound, and then you can just add reverb/chorus/delay or which ever other pedals you desire, as the ac tone is a true bypass pedal, awesome piece of kit for the price