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I believe that on a good quality tarmac surface like the Nurburg ring the RFT's will out perform standard tires.
In real world road conditions, lumps, bumps, potholes, ruts in the road etc. RFT's throw the car off balance and tramline where standard tires soak up these imperfections and keep the rubber in contact with the road.
A UK magazine autoexpress did tests on Bridgestone's test track south of Rome, Italy and found RFT's to have a marginal lap time lead over standard tires. This is an irrelevant result to those of us that drive on real roads, especially in colder than Mediterranean temperatures.
There is also the fact that RFT performance degrades quite significantly as temperatures drop below the range for summer tires (much more so than standard tires) and as the tread wears down past the 5mm mark.
The experience on an E92 may be quite different from E90/E91 though.
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