I own the micro-fine ceramics and I like them. I will typically use them after the 1500 diamond instead of reaching for the lapping films. The ceramic stones are not a rapidly consumable item like the lapping films are (although you might be able to wear them down over the course of a lifetime or two of sharpening). They also leave a different edge finish that seems to have more tooth to it when compared to the diamond lapping film finish, but that could just be a figment of my imagination.
The question as to where they fit in the overall grit progression has been discussed numerous times on the forum. You should try doing a search. Check out this knowledge base article as well.
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