I bought my trike (Trice QNT model which is now out of production) in 2004. It was a desperate bid to reclaim some form of cycling after oveer 5 years of being pedal-less. I got the idea when I was passed by a recumbent bicycle while walking around Stockholm. As soon as I got home, I flung myself into research and decided I needed a trike. I wanted a narrow track so I could get it in and out of the apartment more easily. Something that could fold would be even better. It lead me to the Trice QNT.
I love it because while a DF bike could leave me barely able to get out of bed for a week or more, I can ride for hours with no discomfort. Often, my back even feels better after climbing out the seat. No aching neck, shoulders or rump. No numb hands. Better still, I can drop into insanely low gears and creep up hills without toppling over since I also have bad knees which don't allow me to put a lot of power into the pedals. With a DF, I was constantly walking up hills. I probably set records for slowest climbs, but I do get up those hills without walking.
I also love it because my dog can't pull me around even when I'm stopped. Even lacking the condition I had when I was in my 20's I've ridden my trike for longer distances than I ever managed with DF and I never would have dreamed of cycle touring before I got my trike.
If there were anything I would change about my trike, it would be to replace my 20" rear wheel with a 26" to give my rear derailleur arm greater clearance from the ground when in certain gears. At times, I have less than 1.5 inch clearance which means in snow, sand, gravel, mud or rocky conditions my derailleur takes abuse or acts as a scoop which can foul the chain.