I'm not a real big fan of it for guitar, for any of the types of music that I typically play. There are a ton of great guitar boost/distortion pedals, and they are going to react differently when you change the input source fro,m guitar to some other instrument. So if you are getting one of these for free or near free, who knows? It may sound great on your keys. But on my guitars, this would not be my choice, and I would not pay anything for it. I did pay for the pedals that I use for boost/distortion... the Fulltone '69, Reverend Drive Train, and Radial ToneBone British.
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