I've been using the ceramic guides for over a year, and find them a superior way of controlling the blade when cutting wet wood. Bought the thrust "bearings" a couple of months ago, and have been satisfied with them - until today.
The directions say that "harmless" sparks may be produced, and so they seemed until I saw smoke curling up from under the insert today. I had cut some spalted beech earlier, without the vacuum attachment, and the sparks ignited some of the punky dust which had collected in the little pocket formed by the guide holders and thrust bearing. Don't know if the vacuum would have prevented or exacerbated the problem, but I'm seriously contemplating a return to the steel bearings, at least below, where dust might create a tinder situation.
You're warned.