I agree with Tom.... The thing is that everyone has their own personal tastes when it comes to sound. The keyboard market has changed a lot over the past 3 years. Makers we never thought would produce anything good are now catching up with the big dogs (casio mz2000 is a good example) It'a all a matter of taste. If you've been playing Yamaha for a long time those sounds my grow on you and one might tend to favor them. Yes yamaha does have some good sounds but it varies with all brands.. Yamaha has good pianos and Rhodes ect, and Korg has killer strings. It doesn't matter if it's a casio or korg, as long as it sounds good to the person who uses it...

Squeak