A ton of fun, and it's Metroid too!!
It also does very good job of keeping a "Metroid" feel to the game, with an identical grapics style and sound as well as the items you pickup and use in the game. The enemies are the classics that you would expect out of Metroid Prime one, and that includes a few bosses.
Overall this is more than just a reat pinball game, it's a must have for any Metroid fan as well!!