Once again here is a random video from youtube. As you can see these velomobiles are some of the most popular. There is a large number of Sinner Mango videos I have found on youtube. Some of the videos are a half hour long or more. Obviously a velomobile is a much more comfortable bike to ride than a traditional bike all while requiring up to 50 percent less effort or more to pedal the same speed as an upright bike. The video on the right shows the speed capabilities of a Mango. This one reached 111 kph on a downhill ride.
Update: had a fellow reader link me to some sites showing lots of wonderful pictures. Here are a few from http://vulkanlandbiker.at/gallery/Mango-Velomobil-211-Velomobiel I won't upload many, the files are huge.