Speaking from experience... fourth lap and the 595RS are at their peak. These tyres alone gained me over 2 seconds a lap from the first time I ran them. Even Peter Finlay was impressed with the traction and handling of my car using 595RS at the International Racing Drivers School... and this was AFTER those very same tyres did over 200kms on Oran Park on the same day, not to mention the last 12+ months of racing (same tyres) and winning most of her classes.
To add to this, you will be hard pressed trying to find a semi slick tyre such as these, that will handle so damn well in the wet.
I'm using 595RS on both my Sklyines, both are used for track and street, they are never unplaced even though they are all but stock... you don't get those sort of times without having a good hold of the road.
I call them semi's... most members of the racing clubs I interact with also refer to them as semis... but you can call them what you like, frankly I don't care, because to me they are bloody good tyres which have kept me on a competive edge for 2 years now and I can't wait to try out the new 595RS R's... even if I have to wait a bit longer because its taking a long time for these bloody good RS's to actually wear out.
My local club tried to ban these tyres in my category because they were semi slicks - they had meetings to discuss my tyres because as far as the club was concerned, they WERE semis - to cover the confusion, they changed the rule to "street registerable tyres" to combat the fact that some manufacturers were not labelling semis as such.
PS has anyone got any footage of my squealing biatch so called "top of the range" Falkens around Wakefield at the SAU day (one before last)? All the hype and no damn traction at all, she squealed at every corner... how embarrassment!!!