I saw people trying them out at the Dixie tour back in the year of their original release, but I don't think I ever heard of the compound beating an equivalent RE-71R. Regardless, the step down from 285 isn't helping so it would have to be a stellar compound to make up for that and I haven't heard that it is (again, secondhand knowledge only).
That said, if your budget is a higher priority than shaving a little time at a national event, that price looks NICE.
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2016 Nismo 370Z | SCCA STU Autocross Build WIP
2015 GT-R Black Edition | Sold
2006 350Z SCCA STU prepped | Sold
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