While usage/mileage (15,000+ miles) on my Topolino wheelset is on my single bike, am still very much impressed with the quality/longevity.
Have test ridden many products in our 38+ years as tandem riders, including several prototypes that never saw daylight or a few that broke.
Actual testing on the roads is the true measure of product quality/longevity.
Even now, in our more 'senior years' (80/78), we are still occasional 'test dummies.'
Pedal on TWOgether!
Rudy and Kay/zonatandem