Just joined since I've been hanging around the tandem forum for the past couple of months. My wife and I are serious roadies, but get on our mountain bikes several times a year. After a great tandem ride yesterday on a rented Co-motion we decided to become tandemistas.
Our bikes include a Cannondale Synapse, SR 800, R1000, Specialized and Marin hard tails, and a generic bike to ride out to the mailbox. We are actively involved in the Davis Bike Club (Foxy Fall Century coming on October 15) and I'm the newsletter editor.