Don't know about the 2CT, but my Corsa III's, same type of design, worked great in the intermediate group. If I rode advanced I'd use a track tire.
I did notice that after a few sessions I could see where the two types of rubber met one another.
My bike came with a free five year supply of Corsa III's so I guess I'm sticking with them.
Here's what Michelin has to say about the 2CT:
Pilot® Power 2CT tires add two-compound technology to the already renowned Pilot® Power range. While 2CT technology originated in MotoGP racing, Pilot® Power 2CT tires are intended for the most demanding sportbike riders, who use their bikes both on the road and for track days. Its tread surface is divided into three separate areas, incorporating two different rubber compounds. This helps provide numerous benefits in terms of dry grip, lean angle, handling and progressive acceleration and braking on wet surfaces.
Track-day tire that's equally at home on the road
Real MotoGP technology from the tire company that introduced dual-compound tires in GP racing and has won 15 consecutive GP World Championships
20% softer rubber mix on the edges of the tread yields phenomenal cornering grip
Lean angles up to 51.2° measured on Michelin test track
Precise handling and feedback
An extension of the Pilot® Power line, not a replacement
Lap times within 7% of Michelin MotoGP slicks when fitted to Colin Edwards' Yamaha MotoGP bike at Malaysia's Sepang circuit in February 2006.