I sell the Yamaha PSRA2000 keyboard which also includes the 64MB flash rom memory and the Yamaha Packages that you load into these for different ethnic styles and sounds really contain a lot of new voices, drum kits and styles. The Tyros 4 still wins in this catagory but you have to pay about twice as much plus the tyros has to be loaded each time to turn the keyboard on but not the Flash Rom in the 2000 and the 950. Once you load the package, which might take several minutes, each time you turn on the keyboard after shutting down it doesn't take any longer than the few seconds to turn on and your flash rom is fully loaded!