We bought a Fuji entry level tandem to try it. We really liked riding together, so about a year later we bought a Trek T2000. The Trek is wonderful, full Ultegra, AL frame, fast and beautiful. I've seen S&S couplers, but they are real expensive. My DH rides a Madone, but he really enjoys the tandem. Co-Motion and Santana are big names, but there are many smaller companies making great tandems.