One of the main reasons I've stuck with Yamaha for so many years is the styles, many of which are very song specific. I don't look at them, however, as limiting, but instead, I view them as a wonderful way to expand what is already on the keyboard.
I have thousands upon thousands of song specific styles, styles that have the exact intro, fill, breaks and ending as the original songs. As soon as the audience hears the song specific intro they stop whatever they're doing, get out of their seats and onto the dancefloor. It's almost as if someone turns on some sort of magic switch.
When I had the Korg, G-800, Technics and several others I didn't have that vast assortment of third-party styles available. Consequently, I had to play the intro and ending to get remotely close to the song I was performing, which most of the time wasn't a problem. The problem arose when the main body of the style file kicks in and too many songs tended to sound alike.
Also with Yamaha, the technical support, at least here in the U.S., is rated quite high. And, last but not least, we have a lot of very generous individuals on forums such as this one that are willing to dive in and help when there is a problem that needs solving.
Cheers,
Gary
