me and my ex bought a dawes twocan back in sept. i'm 6 foot, she is 5, so we were really lucky to find a 2nd hand one in a lbs which fitted.
we'd been talking for a while about getting one, and i'd happened to pop tot he shop to get a cable when we saw it. test rode it quickly, went home (in the car), got the bus back to the shop and cycled it home.
we got it due to my then GFs illness too, however she soon got into mtbing a bit, and so we've not used it a huge amount. it is great fun though.
ours is a relatively cheap leisure type tandem, not quite up to off road. we may think about heading off on it for a week or so once we've finished uni (as friends), but after that i've no ide what we'll do with it 🙁
my other tandem experiences are based on an upgraded Viking tandem a friend got off ebay – he added better wheels, brakes and gears, and now has susp fork too. i've pilotted it around GT red, which was incredible, as well as a couple of rides around stirling.
once i've a job, some money and a partner, i'll be really tempted to get a proper off road tandem myself…
they're awesome.