Got a couple of mates use them in 600 Supersport class, they found them good enough to be in the top 4 in the New Era Superclub races the other weekend at Castle Combe, mate Simon also had them on his 748RS which he quallified 2nd in SoT class and led both races until gearbox problems put him out.
As for TA3 I already had full wets for both bikes, had it been dry I would have been on Diablo Corsas on the R6.
No idea of compounds, will hopefully catch up with them at Castle Combe in 9/10 days time and find out more, may even try to blag some part worns so I can try them myself.
Highly recommend them, I have a pair of K1 Racetecs on my SPS - Very high levels of grip and good feedback. Not tried them on the road, but were faultless at Brands and Cadwell. £230 a pair from FWR in Kennington.