I've been (mostly) using the old corsas for years and found them ok on track - but I tend to ride to the circuit so don't use warmers and only go in the inters these days!
Haven't tried the 2s on track yet (PB seemed to think they were good but didn't get great road score)
any way with 3700 miles on the road the old one would be scrap - so pleased with the life-might be able to do a longer tour next year without a pitstop!
can't fault the grip on the road