Since you asked...
I think the first page is a little confusing. It says "search for sailboats," but it doesn't give you any indication what sort of criteria you can search on. Once you search, then the "advanced search" button appears and you can go there and see all the criteria. "Advanced search" or something like it should be on the first page.
Then, here in Florida
(and in the Bahamas), the draft
of your boat can be a major limiting factor. It would be really nice if one of the criteria for an advanced search was minimum draft
of the vessel.
So, a few minor nit-picks, but all in all, I like the idea. Good luck.