I like it, but it must be used inverted. As previously said, it makes a very different AP cup. I get a touch of sludge in the bottom -- Vario ground finer than I use for my 3-cup Hario vac with felt filter. Yesterday, I opted for the paper filter for C+ Panama Esmeralda. I still used the inverted method, and was a bit surprised by the lack of oil-laden froth coming out on initial inverted plunge. The disk always gives almost a foam.
Yup, it's a keeper!