I think the general idea and design is easier for DIY vs RG reactor and the finish product has nice clear housing. It's not Rex's idea.......he just posted it, did a write up etc and promote it vs an AM1000 or a Dupla........
I suggested a few mod's to reduce the mist and also to burp the gas build up that occurs later in the light cycle.
That can easily be done here as well.
If you mist and it makes noise, you are doing something incorrect, poor/bad impeller job I'd say, a good needle wheel will not make any notable noise.
Also, few folks can see the mist except in the rear of my tanks, and only if they actively look for it.