Yes, they cost a little bit, but you get what you pay for. You have to compare styles to others before you realize how good they are. There are drum beats and subtleties and details that you will have a hard time to match, and all the styles have a good beat whether it's hound dog or Bee Gees disco. As far as styles working for different keyboard, I have yet to find a bad style or file for my 9000 or Tyros. And I know from a friend of mine that Solton works great as well.
Dreamer, you maybe have a bad experience with your arranger?

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Roy-Andrè