Has anyone used or serviced (Mavic) ceramic or (Thorn badged) tungsten carbide coated rims (not anodized)?

I'm considering them for 26" road touring tandem wheels, using V brakes - better wet weather performance and slower heat buildup according to the manufacturer (Thorn).

Definitely V brakes, not discs. I'm looking for feedback on the rims - durability, brake pad wear, braking performance.

Will cross post in Touring, Tandem and MTB.