it hasn't impacted our "couple" at all except we can go on long bike rides together without him getting bored or cold from waiting for me to catch up ..
or.. him riding and me not riding because i get tired of seeing him disappear on the horizon.
we have the same squabbles as before, not serious though.
so there are trade offs as you see, but it is probably worth it if you don't crash.

how did we get started? some other tandem people took us.
me on the back of this fellow's bike, and D got the wife on the back of ours
and they instructed us.
the guy i was riding with is 6'3" like an old racehorse. he went really fast and
since i couldn't see anything it was just crazy fun. D had this really sensible
lady on the back telling him what to do. it was great. a great way to start.