Over the past 30+ years we have been 'test dummies' for new stuff on the market, especially for tandems.
Ranging from proto-type tandems (Cannondale, Burley, Zona), tires, shifting systems (STI, DI-2), brakes, belt drive and even a c/f eccentric.
Some stuff worked out just great, others never hit the market.
Seems some companies are just in a rush to be 'the first' . . .
Pedal on!
Rudy and Kay/zonatandem