There are lots of trikes in my club, Catrikes, Wizwheels, a homebuilt, and even a Windcheetah. Most of the owners also have 2-wheeled bents and they are universally slower on their trikes. And I don't see any comfort advantage, either, certainly not compared to my RANS seat. So really, the only advantage trikes have is stability, if you define stability as the inability to fall over at low speeds. OTOH, some of them have real problems with pedal steer and/or twitchy steering, which IMHO is also an aspect of stability. I wouldn't mind having a trike, either; but for the fun of it, not for speed, comfort, or stability.