I always had Yamaha and Roland. Now I own a Korg for the first time and find the OS as simple as the other brands. About the E 80 Fran (almost my name ) I have listen to one in the store and it sounds very good. Better then the GW 8 I owned especially the styles which I didn't like in the GW 8. I didn't had enough money to buy the Roland E 80 so I bought a Korg PA 50. Not a bad choice I think because it sound better to me then the Yamaha psr s900 which is 3x more expensive.