It is a little pricey for the time you are on it. If you drive slow it could last 2-3mins, if you dont brake at all it will last under a minute. But it is an experience. And is fun. If you want to go down fast, try and pick a time when no one is lining up for a minute or two, otherwise you wiil be stuck behind someone who will probably be very slow down the hill, causing you to have to slow down and not get a great ride.
The guys who run it down the bottom offer half price rides after you ride it once, so going again is worth it.