I've been reading Ed's posts for some time, both here and on two other forums. He knows his roofs, a true professional.
Here is the science behind his statements: http://www.oikos.com/esb/30/atticvent.html
And the test results, again proving his point: http://files.buildsite.com/dbderived-f/airvent/derived_files/derived20936.pdf
I'm not sure if it was mentioned, as rain/wind goes over the ridge- water is forced into the attic through the ridge vent (non-baffled), which could quickly render your insulation useless and cause mold growth. Along with adding additional weight on the wallboard ceiling, causing nail dimples and ceiling material sag. Be safe, G