They'd be better than Mavic, probably worth it. I suspect Specialized get their tyres made by Vittoria tread pattern and tpi is similar. Want to get my hands on the fabled Turbo Cotton that Tony Martin has used, but it seems like vaporware at the moment.
These any good? http://road.cc/content/news/144631-specialized-tyre-amnesty-returns-get-new-pair-s-works-turbo-tyres-reduced-price
Thinking of trading the mavic tyres