It's really just a
buffed TI-85, but it has more
RAM and a faster
processor. It even has a faster processor than the one we sent people
to the moon with.
It's also a great thing to put games on. Using assembly to replace the backup memory, it lets you play such things as Tetris, Breakout, and a host of home-brewed programs. You can look productive while still slacking off in class.