If you ever get the chance I would recommend checking it out. if a friends got it ask if you can come over and piddle around with it.

Or you can always go to the Mac store in a mall or something and just use one of their computers and if someone says something to you tell them you need to know the capabilities of Garageband to decide whether or not you want to buy a Mac...

(what they won't know is you won't be buying a Mac though... )