I have riden recumbent trikes and bikes in many different parts of the US and world. (retired navy) for the last 20 odd years now. Below are some of the sites I have been looking at for my next trike.
Yes, you should get a flag for parking lots and hilly roads, but they are noticed! Because they look so different then ordinary bikes. I also recommend a helmet. So far, I have only dumped twice on the 2 wheeler and none on the trike. I have pedaled up to 30 mph flat and level on both trike and bike, and held nice rides though parks and flower garden areas at walking speed while talking with others that were walking.
They are very comfortable to sit and ride in. You can get light ones, folding ones, heavy tour ones, racers, electric motor assist ones, and fully enclosed ones for riding in all weather.
The only muscles that will hurt after a ride are your legs from pedaling and your face from smiling so much!
Recumbant - YouTube
One of the main reasons I moved to recumbents!
Evolve recumbent trike folds up in seconds, fits in trunk of smart car - Image 1 of 22
The next trike I am looking at for my RV travels
Kinetics - The HPVelotechnik Gekko Folding Recumbent Trike
One of many folders I have looked at.
Greenspeed Recumbent Trikes - GT3 Folding Trike
One of the top recumbent trike makers
Recumbent Trikes - ICE - Explore our Trikes
I currently own and have ridden it year around when I lived in Wisconsin. An ICE Explore trike
As earlier posters have said, they can be expensive to buy. A friend bought one of the cheapest ones I have heard of 10 years ago ($500.00) and still rides it with simple repairs, (tires, chain, plastic fenders). I have owned my trike for 15 years. Rode it in snow, rain, hot and cold weather as a commuter and for pleasure. Did a few Across Iowa trips, Across Wisconsin, Michigan, and other vacation rides.
I also have a two wheeled recumbent bike that is the same way. Years old, no rust, not falling apart. Simple repairs. (tires, fenders, chain, pedals)
So they are made to LAST years.
Hit 55 mph down hill on a long grade and felt solid on the trike. Had the gears to ride up hills at a walking speed, but still made it up!
Rode in San Francisco bay area, Des Moines Iowa, Grand Rapids Michigan with out problems.
Because recumbents are so different looking, drivers (Big Rigs, trucks, buses, and cars) notice them! Where a standard bike is treated as "oh, just one of them, who cares"
Biggest effect, if you don't like talking to others, DO NOT get a 'bent. I have had 80 year olds and 8 year olds come up to me and start talking. Asking about the trike and bike. I even have had teenagers talk to me and say what a nice bike and trike I have!!