Has anyone used these ?

Im looking for a decent tyre for both track and road use, i used to use f1's but i cant get them anymore

Iv found a set of these on ebay for £335 which for a decent gripping tyre is a bargin compared to proper track tyres which are about £550 a set!

http://www.tirerack.com/tires/tires....VAN+Neova+AD08

http://cgi.ebay.co.uk/195-50-15-YOKO...c#ht_919wt_689