I loaded a fairly recent backup from my 61 and everything works great.
Not certain if I like the 76 keys that much. I like that I don't have to hit the octave button so much, but the reach with my left hand to the joystick is a little longer than I'm used to.
It seems really heavy, but is supposed to be only five pounds more than the 61. I rarely move it anyway though.
I think I'll take it to the job tonight. It means setting up a different kb stand and rearranging things a little but no huge deal.
If it proves too awkward I think I can trade it for another 4X61.
I'm so happy to have all "MY" controls again, and that wonderful vocal harmonizer, and the touch strip, and the sliders and the buttons, and the EC5 controller, etc., etc., etc.