I tried it, and kinda liked it. No not the rEvo, just the discarded Draeger gag strap.
Perhaps I should have put this in the rEvo forum, but there is probably some sort of rule against me posting there.
The local rEvo factory is putting out scores of smug (competent of course) new divers who seem to favour a long hose with the reg bungeed around the neck. The ones I know also ditched the gag strap.
So I got to try one. It fits the Meg just fine. The bite blocks beeing thicker help keep my mouth open wide and the WOB is no doubt aided. On longer dives I am more relaxed and it clearly resists disloging.
Bailing to OC is another matter. My preferance has been to push the loop up but the strap makes this problematic. Also I can't see much over my loop.
So just how do you Dolfin/rEvo/homebuilt guys do it? There is a lot of talk here of bail, bail, bail, whenever. I expect that this not so much the mantra for the strapped in crowd. Curious though.