I have often thought when I get old enough that I can't ride a DF bike I will more than likely get a bent. I tried one in fact a few months ago and guickly discovered while the seat was pretty darn comfortable it took a whole different group of muscles to ride. And contrary to what my good friend Dudelsack might say I can't imagine passing a good DF climbing a good hill. I am not saying it couldn't happen just that it would be unlikely with me on one. During the Palm Springs Century this year I was past by one or two bents on the flats but caught them on the climbs. And because it was so windy for the first time they didn't pass me going down hill.

However like people have mentioned they are expensive and a PTA to load and move if you happen to be driving somewhere for a big group ride like a century. Most of the ones I have seen will not fit on a bike rack and they are heavy. Still someday I want to get one because of the N+1 rule. But I am thinking a Cat-Trike.