I had a bit of a problem installing it, because the first port I plugged it into apparently doesn't work (aargh). And since it's a serial port, I had to shut down the computer before plugging it into the other one. (At least I assumed I had to. I dunno.)
But anyway once I did that, installation was a breeze. Now I can still mouse around, but I can also, like, DRAW. Bow down to my mighty stylus!