Had the Classics for 4 plus years never a problem, a nice wheel set, moved on, put a set of Enve SES 5.6 DISC brakes on our Filament tandem going on 3 years, what a difference, handled better, stable at all speeds, Sram etap DISC breaks mega stopping power, plus don’t get moved around in high wind descends. Had Enve built a custom set using DT Aero Comp for extra strength, Enve agreed with me that on a tandem usage this was the best way to go, normally they use lighter spokes, Enve SES Non Disc might work for you with spoke modification, choose wisely, and good luck