I had Pi and Phi almost from the first day and now with version MKii I am very happy.
when something must be heard in my mix I use Pi and Phi it brings the the "sound image" something like in front of the speakers.
there is no other like this, in analog or digital world, it's a category of his own.
everything that pass thru Pi and Fi will be heard no matter what...!!! and that's really great I have try it in many of my projects as channel insert or as bus insert and it makes everything just sounds better.
It's very easy to use and brings my SOUND very quickly.
MKii version has 2 bands more and sounds even better.