i'd warn folks as 100% in all tests can be dangerous to a site's livelihood and traffic..
the proper way is to fully analyse all sites traffic and browser breakdown for sites you intend to deploy SSL on and make sure your web site traffic won't be adversely affected..
Google Analytics can give you a proper breakdown of web browser and browser version and OS stats i.e. for one of my sites broken down by WinXP vs non-WinXP and then by specific browsers and their versions
