I investigated them at
Boca Bearings before they got ink in
Mountain Bike Action. I ended up with standard steel industrial bearings but the ceramics were intriguing. Boca had the MBA article because they were wanting to move into the MTB market and were aggressively pushing their ceramics and offering sponsorships to run them. They are supposed to be tough but I worried abouut brittleness for suspension pivots; my concern may be unfounded.
I'd check the ceramics at Boca; they are a great company to deal with and their prices are hard to beat.