Good once you have heat in them, you can really nail it in the dry (K60) med compound. I bought some old tyres (5 years but still had preserver on) and I think they're probably better younger. I had no grip in the wet until they were warm (on the rear they were useless but ok on the front/FF car).
There's not as much tread as r888 or 595 federals which means driving home on illegal tyres if you don't watch the wear.
They were so stiff to get on, now my mate won't change my tyres any more!! The sidewalls are mega strong.
Easy to spin in the dry if you have them on the rear and they are cold also, beware.