I use one at my local gym. They are excellent fun and also provide a good work out. Excellent for core stability. I promise ten minutes on the board and you will be in a sweat. My gym also offer group work-outs where they do all sorts of different excersie on them.
All in all very good for you, although I think they are a bit pricey for what they are. I guess trawling the interweb my come up with a good price, but I think they are generally in the £60.00 area.