I currently have a Madder, great fleet boat, plenty of them around. they do struggle with Foliis up wind. have seen some magical M boats, and some not so magic, they are great in flat water, not so good in Miami, if you don't have any plans or expectations for the winter circuit and want to go...
Looking at it strictly from hull #s one would want to be careful about anything pre 7000 series. in the late 6 thousands a hull keel break thru made almost everything obsolete up to that development. you can still race with the early boats, they just don't seem to run with the big dogs in...