Depends, I have my psp with tons of homebrew on it, and is great for any emulation except you might have trouble with N64 emu and the gba. Gba emu is only trouble because of obtaining the illegal bios, and the n64 is compatible with anything. Otherwise it's nice, and I use the Snes emu mostly which has complete button remapping, autosave every x minutes, and a few other things. The only thing you should be worried about is anything BUT emulators. Also, read extensively on every amount of info you can get for the installation and stuff and comprehend it, it's easy, just takes a little investigation. That's only if you choose psp. (Which i had anyways)
BTW, the gp2x website isn't showing.