Add to your list of manufactures, DiBlasi who also makes one of the most advanced folding trikes.

I thinik about 90% of the folding bikes don't fold well, and don't ride well, especially the older models from the 60's to 80's.

The 10% that are good are quite expensive, but to some extent rival the non folding bikes in ride quality, or so they say.

I think you've hit it on the nose. Space is one of the issues for folders, home, work, or in vehicles. If one can adequately store the bike, then there is no need for a folder. Perhaps it is more than just space as many Americans will happily store their bikes in their living rooms whereas people in other cultures may not choose to do so. Theft from bike racks?

I rarely ride less than 10 miles each way, 20 miles RT on my bike. I NEED a comfortable bike. I wonder if some of the Asians using folding bikes ride them for less than 1 or 2 miles (walking distance)????