I have it, and I think of it like this: Are you an Ayu fan? You'll like it. Do you have little to no interest in Ayu? Steer far far away. I have no problems saying that this is a FOR FANS ONLY game.
The idea of it, disc one has the Dome Tour and allows you to put special effects over the display, choose angles and sometimes zoom and various other things. Kinda nifty, not too impressive. The second disc allows you to remix two of Ayu's songs. It's kinda neat.
You need a Japanese PS2 for this game, or be able to play imports to run this one.