I gigged with it the day it arrived. It's so simple to use. I just set up a compressor, copied it onto the first half dozen slots and added one effect to each. Then pressed the right or left button to find which effect I needed for which song and either turned it on or kicked it in when I needed it.
The envelope, synth, phaser, fuzz, chorus and octave sounds were brilliant. If I needed to tweak them it was a piece of cake.