... the Easy Wood guy goes on and on about how wonderful it is that his tool provides support directly under the cutting edge. Unless I'm REALLY missing something ...
I think perhaps you are missing something.
At the last meeting of the woodturning club I attend, the presentation was about Easy Wood Tools, by a member who teaches turning.
He related the story of how he saw Craig (Jackson?) at a show and circled round a few times. Eventually Craig said "try this", to which he replied "why would I spend so much when I can make that myself and just buy the cutting bit?"
him a cutter, and said "try it -- call me back and let me know how it goes."
2 weeks later, after a phone call, Craig sent him an EWT handle saying "now try that cutter in my handle ... if you still don't like it, send it back to me."
He bought the handle -- and several others.
It seems the difference is that the seating on the EWTs is ground to the profile of the cutter bits -- providing support all around the bit, and preventing the bit from vibrating (chattering, if you will) on the shaft of the screw that holds it in place.