Yes, especially becuase of games like ff chrystal chronicals (for gc, only multiplayer w/multiple gbas.), four swords (same as ffcc), megaman battle network series (gba), and all things that need WIRES for multiplayer.
I definitely am a little mad that Nintendo didn't put a wired multilayer slot for link cables for the gba to gba mltplyr games as well as gba to gc mltplyr games.
I also use my sp for gb color and gb pocket games, for neither the gbc or gbp have a backlight in it, and the ds isnt capable of playing these.
Love the pokemon pinball, zelda seasons ages, zelda: links awakining, things like that!