I used the NT01's for a season with many heat cycles. I really didn't notice any drop off in performance, and I like them as a track tire for their durability. Certainly not as fast as the full R-comps but was faster than the RE-11 by a second or 2.
The only thing I don't like about the NT01 is the noise (okay for driving to the track but I wouldn't leave them on). Also not particularly good in wet conditions, for that I would go with a full tread depth tire.
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