I just went thru one for a guy and I played it a bit.
For me it wasn't anything to write home about. The game play and goals were less than spectacular and was rather easy to keep the ball in play, and I certainly wouldn't want to own one or look at it every day, but it was his only machine and he likes it.
The pro is $500 is not the end of the world to spend on a working game as it should be easy to move at that price if you decide later it's not for you.