I have the Volant, very happy with it. My advice is that the difference between all the brands is negligible and and probably immeasurable so I would get whatever one peaks your interest. If I was in the market for another one I would probably try S&B.
I upgraded my system with Volant as well, and couldn't be happier! Installation was actually pretty dern easy (espeically since I didn't realize the instructions were on the back of the diagram). The only thing I'm actually considering is ordering the Ramscoop for my system as well.
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