Not worth the money
If you've played the Dreamcast version, you will notice the pace and speed of the game. Take that, and reduce it by half, and you have the PS2 version. The game is exactly the same as the Dreamcast version and doesn't offer anything new, but if you don't have a Dreamcast and you're interested in an easy shooting game, you may want to try this out. The slowdown actually helps through the bullet patterns but unfortunately doesn't feel like the real experience.