I think a lot of the C ratings are fiddled anyway, there is no standardised test that suppliers/manufacturers use to determine the C rating and I doubt that each lipo is tested before dispatch from the factory.
Big Squid RC and Ultimate RC (both in the US) have done some tests between different Lipos which have consistently shown the advertised C ratings are wide of the mark for most except Gens Ace. You can find one test here:
http://www.bigsquidrc.com/lipo-batte...0-mah-edition/
Orion cells are good but when they can be compared to a budget cet from Gens Ace for voltage under load you have to question the advertised C rating.