I used to have that; it was a better GBA than a GBA itself, and I could even play Nethack on the go.

WIth a custom CFW you OFC could play Nethack at 50MHZ (With a MIPS CPU even 25MHZ would suffice), where I was more hooked than with Castlevanias...

Oh, and Scummvm, too with Broken Sword, Future Wars and the like. And ScummVM still makes releases so you can totally play Blade Runner in a PSP (and far more).