That new M3 is a freakin BEAST!!!! It's so cool that the screen will also function like a Kaoss Pad. That tripped me out watching the demo of it used. I didn't even know that was a feature until he used it.
Spalding the Karma Technology is no joke man. You can do some crazy stuff with it, plus if my understanding is correct the M3 features Karma tech based on the Korg Oasys. Go to Korgs website and have a look at what Karma does to guitars

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GEAR: Yamaha MOXF-6, Casio MZX-500, Roland Juno-Di, M-Audio Venom, Roland RS-70, Yamaha PSR S700, M-Audio Axiom Pro-61 (Midi Controller). SOFTWARE: Mixcraft-7, PowerTracks Pro Audio 2013, Beat Thang Virtual, Dimension Le.