Last weekend I sailed the NSR 2006. The Infusions look fine, especially in their first year. Some small problems. But saying they're the fastest F18, well no(t yet). A little addition to the text is that all dutch top-teams from last year switched to a F18 Infusion.
The only comparison can be made in international races, and in these races Darren Bundock/Glenn Ashby are still fastest on their Hobie Tiger.