I didn’t try, but i am playing clean electric, and the Pitchfork definately ruins attacks and tone to an extent, that wouldn’t qualify for me to use with an acoustic guitar. Plus you have to play ahead as the effect is lagging somewhere in the 40 ms range.

I use it rather as an effect unit, like one you can hear and use for it’s unique akwardness somehow. Pitching down a electric guitar with flatwound strings makes a nice akward uprite bass. Of course you could as well do stuff like looping a clean picking, then play the same pitched +7 on top. But this you could do more clearly, when just moving up 7 frets. My 2 Euro cents.