This is one of those keyboard that will stay in your toolbox for a LOOOONG time. Between the Synth Modeling and the expansion boards, you can just build your patch library to just where you need or want it to be. I would love to start voice modeling with that beast. I did own the M3 which had the HD-1 engine and that was sonically outstanding, to that they added most of the Oasys features. This is a great deal.