Dreamer says "each style has 2 variations" but the SD1, like the X1 has 4 variations per style.
Senior, I've had the SD1 now for over 2 months along side the 9000 pro, and both of these keyboards are great. Sounds are strong on both, features are strong on both, ergonomics goes to Yamaha while the style quality goes to Solton.
I beleive that once you own any of the higher end arranger keyboards and take some time to learn where things are, they become "comfortable" to use.
George Kaye