I'm a touring musician, been playin guitar for living for more than 15 years and that's a pedal that I really love.
I have owned dozens of different pedals and at the moment have at least 5 different drive pedals in my pedalboard for various styles and sounds and Mad Profersor Royal Blue is the keeper!
Very organic sound, takes well humbucers as well as single-coils. Very versatile and touch sensitive.
Like the way it responds, like the way it sounds. It is definitely different from the others (that's the point why I bought it), but suits well to the mix.
I play it alone or combined with other overdrive/distortion pedals - works great.
I recommend to order it and hear the sound yourself. You might like it and don't want to send it back. That happened with me :)