It's hard to really put into words the amount of joy that you experience while playing what's essentially an upgraded version of Pac Man. The only way to really understand what's so great about the game is to actually play it, and Namco really did a smart move by pricing it at $20.
If you ever see it, impulse buy it. If you don't like it, it's EASY to unload. EASY. People everywhere are trying to get copies of it because it's in such short supply (Namco produced plenty of copies but no one ordered any since they didn't perceive any demand for it).
I've yet to meet anyone that didn't fall in love with it after playing it.