My K-61 arrived Saturday, but due to an illness, (cold). I have not had a chance to try it out until now. The keyboard is very lite weight, keys, feel like synth keys, and it's very esay to install. I put it on the keyboard stand, where the Poly-61 was sitting. The M1le software is a nice ssoft synth to work with, took a little while to figure out, how to work with it. But once I got it, it's reall not that hard to get around. Unfortunetly, I can not compare the M1-le to the M1, but I Korg did a good job, in recreateing the M1.