What do you think about a race board?

I am considering buying a race board.  I am going to try one first at The Zu boardsports.  They have an Airush Sector 60 on demo.

Airush Sector 60

Naish Venturi race board

Here is a video of one in action:

Some advantages I see are:

• great for downwinders - long ones
• good for low wind days - lots of bouyancy.
• another variation to try out
• handy if I ever want to have a go at course racing
• good for speed runs - if I ever get to go out at Sandy Point.

Some disadvantages I see:

• long fins - no good for shallow water
• hard to turn/tack - gybe turn required?
• an extra board to squeeze into the shed
• not so easy to transport - long board and long fins

Have you tried one out?  Any comments or suggestions?