Has anyone used both of these? I have only read up on them on their websites, and through thread searches here. The Grinder has more features - and useful ones too - namely, a blend control, two expression pedal jacks, and more frequency range controls which I don't fully understand. Not that the 3Leaf skimped. It is pretty loaded too. But the Groove Regulator sounds fatter and warmer to me (going only by the soundclips on the two websites), and it is HALF the cost of the Grinder. Any thoughts?