daVinci folks buiild a great tandem.
Test rode a prototype about 15+ years ago and was really impressed with the super-smooth front der. shifting over 4 'cogs' and workmanship on the frame!
However, being very long time OOPers we did not see any advantage for us with ICS.
Just our input . . .
Pedal on TWOgether!
Rudy and Kay/zonatandem