I ride to ride
Join Date: Aug 2005
Location: Somewhere it gets cold in winter
Gatorskins have an inner layer that supposedly helps to prevent flats, and tubulars pinch flat less then clinchers, so I wouldn't really worry about getting a flat any more then your standard tires. Also you are able to ride on a flat tubular for a short distance, so if you flat near the end of your race, you could still ride in.
However, if you get a flat during a training ride (is this what you're planning on doing?), the repair isn't as simple as patching or replacing the tube. For this reason I would use them as a race only set up.