I've had this as part of Komplete for ages and have never really tried to do anything with it apart from load it up and listen to a few chords. Well tonight I tried to use it in a song (after actually reading some of the manual!)
It's good! I won't pretend it's not frustrating trying to "program" the grooves and chords into the PRV, and it does not always work as advertised (lots of tweaking required), but at the end of it I've gotten some very well recorded and consistently played funk rhythm into my track and it sounds great (it's going through Guitar Rig too although I might well change that).
I wouldn't use it for anything guitar-prominent, I'd probably pick up my own guitar and play something more interesting for that. But for adding a bit of ssppiiccee to a funky rhythm track I would definitely recommend it.