I need to decide between Yamaha Clavinova cpv 309, Roland KR 107
.
I cannot tell you about The Genesys Ensemble or the Wersi Giga Piano. But I purchased a Clavinova CVP 307 over the Roland Kr 107. All my training was on piano and I found the action of the 307 excellent. I found the 307 to be an outstanding instrument. I would have liked the 309 because of the natural wood keyboard. But I could not justify paying the additional dollars for the 309. My long time friend who is the Yamaha piano dealer where I live advised me that dollar for dollar the 307 was the best buy out of the 2 instruments. Another reason for the 307 purchase was that it is very compatible with my PSR 3000. I can work at the Clav, save styles to a usb drive and then simply move my work to the 3000.
One other thing worth mentioning is I sold my Samick acoustic grand piano about the time I bought the Clavinova. I can honestly say other than not having a beautiful piece of furniture in my home, I don't miss the Samick at all.
Good luck with your decision, it's a very personal choice especially when spending that amount of money.