Great when tandems do work for a duo.

He does cycle to my stopover midpoint during my daily work commute where I pick up my bike from a bike locker and we ride homeward.

But a tandem will probably get me in a more sour mood after certain wierd work days. I'm 5'1" and he is 5'10". Tandem just doesn't jive well with us...we did try it-- once.