I have a ceramic bearings bottom bracket since 2008 or so.. It's one of those item that you put on your bike and fuhgeddaboutit; never needs maintenance, even though I ride that bike all season, through winter salt, mud, rain, etc... Over ten years and I have yet to take it apart to inspect whether it needs cleaning.
I can't tell whether ceramic has less friction that other bottom bracket material, but I like the zero maintenance over ten years of usage.
If you have a bike that you plan on keeping for long time, it might be worthwhile to invest in ceramic stuff just to save you some maintenance time on the bike.
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