A third wheel makes you intrinsically stable, even at zero speed (well, mostly, anway - see the Flevotrike for an exception). Not having to think about balance and never having to unclip from the pedals at traffic lights make riding a trike that bit more relaxing. A well-designed trike can also be exceptionally stable at high speeds: you may have to crank uphill in a ridiculously low gear, but the downhill is so much pleasanter when you know you can do an emergency stop without ending up in the ditch. I currently run three trikes:

• Trice Micro - a fast, ultra-low sports trike
• Mad Max- higher than the Micro and a touch more sedate, unless you take advantage of the all-round suspension to use it on mountain bike routes
• Flevotrike - an unconventional front-wheel-drive, moving bottom bracket design that I use mostly as a load-carrier.