The M3 is a hell of a synth....what you see in action is Korg Karma.
It's cool FOR COOL MUSIC...but, it is now very useful for some of the music a lot of arranger players do.

At least that is the impression I got when I spent a little time on it when it came out.

In fact, one day when I was at Sweetwater Sound..playing around with a PA2, a guy and his wife came over and said' WOW, I think that is what we should have bought..we can't get what we need on the M3 we have' So, even though I don't work there...I sold him one!

I will say...Kerma has some cool features and it is not regimented like styles are. I was hoping they would dd it to the PA3X..no dice!

I will also say, I think if you are a piano style player, and a good one...you can have a good time and make some great music. If you are just playing chords in left hand...not so much.