"Just zis Guy, you know?" wrote:

OK, we reviewed the available offerings and decided that for the best
balance of performance, convenience, adaptability and fitting in the
corner of the kitchen, the winner of the Which Tandem competition is:

http://www.foldingbikes.co.uk/bf_tandem_twos_day.htm

Great, but expensive. Worth it, though, as it should last us a long
time.

Last time I rode one it seemed rather flexible.
I hope the newer versions have overcome this. Its a great concept.

John B