My first session at Sandown ever was in the dry, second session it was pouring rain. Still good fun, you jsut have to be very careful and use higher gears, 3rd when you would use 2nd, 4th when you would use 3rd and be smooth. In a perfect world you would do every track in the wet, for me the next time i have gone somewhere in the dry i have always been quicker. Slow mo in the wet gives you time to really suss the lines