On Wed, 01 Apr 2009 17:56:33 -0500, cavelamb
wrote:

Anybody have any real experience with any of these - for comparison purposes?

When I was a PHRF handicapper we used to rate the centerboard versions
of the same boat 6 to 9 seconds per mile slower. At 5 kts that works
out to less than a tenth of a knot difference. That's a big
difference in racing but barely noticable to most cruising boats.
That assumes that the centerboard is properly faired and kept in race
ready condition (spotlessly clean).