I had Mavic EX721 ceramic rims on my Raven Tour for about 18 months, and despite trying a range of brake pads I could never get decent braking performance in the wet. The first few rotations of braking seemed to have very little effect, and then lots of finger pressure would eventually bring the bike to a juddering halt.
I recently changed to the Rigida Andra tungsten carbide coated rims with the blue Swisstop pads (I've done about 500 miles with them). In comparison, the dry weather braking isn't quite as good, but the wet weather braking is much better. Yes, you lose some braking performance in the wet, but there's no longer the panic of nothing seeming to happen when you first apply the brakes, or having to keep the brakes on going down hill to attempt to dry them out. They do make a bit of noise on occasion, but now that's usually just when the weather's damp, and I can put up with that in exchange for being able to stop!