Hey Gilo, sorry haven't done a 2 up face off yet. There was a short session that Scoot M did, but I wasn't there. It as between a Nacra F18 (not the infusion) and a new viper fresh out of the box. It can be seen here

http://boatsbikesboards.wordpress.com/

In that test, I believe the Blade lead the way through the entire test, but the F18 was still not done being setup right and the Viper crew was brand new to the boat, so I think our one on one face off was probably a more accurate comparison