Well, I am new to the A class and sail an older Waterat. They are easy to sail, but definately have a steep learning curve when it comes to maximizing speed. Beyond that, I would choose an A over an F-16 because of the consistant develpoment going on in the class. I sail at 185-190#. My boat handles that well enough. The Tool from Australia and the new Scheurer 5 are supposed to be designed to handle heavier sailors. Again, you can look at the UK site, http://www.aclasscatamaran.co.uk/contacts.html