They make very nice products and if you are in search of that last half of a watt in performance and/or at the very pointy end of the pack then I think the natural answer is yes. However, I think for most myself included and I absolutely love bike gear I just can't justify spending the dollars on this type of upgrade. I know I have a long way to go before I've exhausted all other avenues to get faster on the bike.
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Here is a quick review: http://www.bikeradar.com/us/gear/category/components/product/review-ceramicspeed-mavic-1-bearings-11-45042/