Definitely worth the money and time it takes to install them. The Ramble vent covers are supposed to allow better air flow but either will do the job. There is now the MaxxAir II vent cover. Not only do I put on the MaxxAir vent covers I also put on the Turbo/Maxx vent fan. It takes a little longer to install but it does a heck of a better job than the 12v fan in the bathroom. Much quieter too. As you can see in my sig pic below I turned the vent (no fan) in the kitchen area into a high-powered vent with fan using the Turbo/Maxx and placed the MaxxAir vent covers over the bathroom and bunk area vents.