First one, ONE key (Highest C)--out of box--the only problem.
2nd m50 wouldn't even boot up. only joystick light lit up.
3rd, lost the Program Mode Button backlight, within 1 week.
Now on my Fourth m50, happy to say, all is well. At least G.Center gave me a good deal at about $1445 for the 88.
Lost about half that in gas

New to the forums, don't normally knock Korg, but had to mention these m50 issues. What are the ODDs of getting 3 defective keyboards consecutively?
Rich