Well, the others don't work unless the wind is blowing so choose your poison.
I considered these when deciding what to replace the standard vents on my ACE a few months ago. I went with the cyclone vents because they worked so well on my last TT and Camping World had them on sale with a 2 for 1 deal.
Probably doesn't work too well at night when it is needed most
Im sure they dont work at all at night but they would still funtion like a traditonal vent at night. Im bet the cyclone work better overall IMO. But while traveling during daylight when a the tanks are getting stirred up they might make a diffence.