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I have the RT-615's. I've ran that at the AutoX, at TGPR(in the rain) and VIR Road Courses for four 30 minute sessions each day, and about 2000-3000 miles on the street. They have performed very well for what they are. They start to get greasy and fall off towards the end of the day on a road course. It's a street tire though so it gives you warning before it does where a R Compound just grips, grips, grips... and then let's go without warning. The thing that surprised me the most about these was the wet grip they had when I drove at TGPR and it rained all day. Don't get me wrong, they aren't an all season tire, but the wet grip they provide for being a performance street tire impressed me. Most people I know of have been seeing around 10,000-12,000 miles out of these tires.
I picked up a set of Dunlop Direzza Starspec Z1's a while back for track use this season. They were reasonably priced as well and the way everyone has been talking about them... they are suppose to be the cat's meow. I'll be back in the states Mid May and I have my first track day May 22-23. I will have track events almost every weekend after that as well as some autoX's thrown in. I'm sure I'll post a review of them but that won't be for another few weeks and I'm sure you are trying to order tires now... so it prob. won't do you any good.
As far as the new XS's and the NT05's, I have some friends them this summer and once I compare my review with theirs, that's what I'm going to base my next street tire purchase on.
All in all I'd say they are all pretty close in performance and if you aren't racing, a second here or there doesn't really matter, but getting more seat and bettering your driver skills does.
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