I have Ozone and Circ on my R7, we had it on our old tub too. Wife is sensitive so allows to keep bromine levels lower than without it. But it's really a personal preference. I don't believe it really saves money on "efficiency", especially when you factor the upfront cost. Some people consider it one more thing to break, my old one never gave me any trouble and supposedly it was one of the ones that gave circ pumps a bad name. The BF circ pump is a lot bigger than my old one, and noisier, but only because the other one was totally silent. You can hear the BF one if you're standing near the tub, but certainly can't hear it running from in the house.