The E473 is a starter model with (i think) only two variations per style. So it cannot take advantage of the huge style library available for Yamaha's TOTL and MOTL arrangers. Meanwhile the Casio does have 4 variations per style and most of the same stype control parameters as Yamaha. I think there might be 3rd party software to convert Yamaha styles for use in the CT-X5000. So unless you can afford to step up to the PSR-sx600, you'll get more bang for your buck with a Casio in the low end of the market. My $.02.