I used Casio, Roland, Yamaha and Kord Arrangers for the last many years and came to know about Ketron (previously known as Solton) in 2001. Based on the recommendations from this forum I have purchased my SD1 in 2002. No regrets since then. Great Board, operating system is a bit confusing, but once you are used to it, is very flexible. Its really a great sounding board.