I am happy with the Mavic 618's on our tandem, used with 1.5" tyres.
I'd don't know if 1.9" tyres would look a bit wide on those rims, though..
We paid extra for the ceramic version, so they are black/ dark grey all over. And they seem to work much better in a downpour than the plain aluminium rims on my cheapie solo, once the pads have wiped the braking surface dry.