I tried a set of 2ct tires out because i got them for a good price. They worked great until i got my speed back up to where i was april of 09 (last time i rode on a track).
Definitely not a great tire for someone who is even only moderately quick. They are great for new track day people though.

I am switching to the competition series now.

Are most of you using a V front and B rear?
How much life are you getting out of your tires? A few track days? One or two weekends of practice sessions and a few races?