As new, poor grip, and take more time to break in than Michelins, Schwalbes, etc. But then the grip is awesome, easily the likes of Ultremo, Pro3, etc. And I push corners.
That points to there probably being some mould release (or some protection against rot perhaps) being left on the tyres as they leave the factory.
Washing the brandnew tyre with a 1/3 solution of vinegar and water should improve things noticeably.
I do that trick to all of my new tires - I think I'm just superstitious as I as a young rider was told be a old world champion that this trick made the tire more punchture proof
When I lost the grip on my tubulars they were more than 1000 km old so I my case I would say the were broken in. The thing is I also find Vittoria Corsa Evo CX a bit slippery i wet condition but they are constant a bit slippery so you adjust your riding style to this. They are predictable. Whereas I actually found the Challenge okay but all of a sudden you just totally looses the grib. I have never before and after noticed such a behavior with any other tire/tubular. It was like you could push them to a surdent degree but beyond that limit you just can't trust them. And that's a big problem in a race!