From observation of lending mine out, couples either love or hate tandems. I think it all depends on their mutual levels of pig headed / control freakyness. Personally I love them, but I’ve seen some couples break down into a row within minutes of riding them. So seriously, try one out for a couple of hours before you head off for a few days :o)
If you’re going at the front, then lots of warnings to the stoker about whats coming up really help. Like “bump” means there’s a big bump coming up, similarly when you’re about to brake, stop, corner, change gear etc. Also make sure it has a suspension seatpost at the back.
We don’t use ours every week (a cannondale road tandem, very fast) but it’s always a blast. Also very useful for going out short to medium distances when you both want to have a drink.