I finally dove my PRAM with the new duckbill eliminator yesterday. I've been diving my RAM the last few times which has a regular duckbill. The difference between the two exhausting air is remarkable. Exhaling with the eliminator is so effortless that I would compare it to exhaling using my conshelf. I found myself having to quit making a forceful breath out and just exhaling like I would with any good single hose reg.
The other great improvement comes when installing hoses on the reg. It is so much easier to put the exhaust hose on the reg when you don't have to stretch it over the duckbill every time.