I used to have a Nagaoka roller (it may still be hanging around somewhere) but found that it really didn't do much. My gut feeling was that it simply moved the dirt around rather than removing it.
I have one. It certainly doesn't just move the dust around for me, it's quite sticky. It removes the line of dust left behind by a CF brush very effectively.
OTOH it does leave a slight but visible film that's clearly visible in the dead wax. Therefore, I normally only use it to remove dust before cleaning the LP on my RCM. I rarely used it before playing a cleaned record, and then always with very light pressure.
I have found this cleaner to be an OK first step if you have a particularly grimy record. For older flea market type records I use mine in coordination with my Nitty Gritty 1.5, and it world wuite well. It removes some of the "fugliest" substances, though it does seem to leave a film. Hence my recommendation that it be used with a vacuum equipped cleaner, similar to the Allsop Orbitrac.
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