Which Folding Bicycle Design has the Best UX?

In addition to the well-known Brompton, there's been a bunch of innovation happening in the folding bicycle space. These have varying degrees of folding difficulty. Architect Il Hoon Roh's Mikalon design asks a lot of the user:

Analog Machine Works' Tetra seems a bit easier:

This GT20 design from Fhnon does the Tetra one better, adding fold-down handlebars:

My vote would be for the GT20, which I also find easier on the eyes. Then there's this: At press time, Fhnon—a Chinese manufacturer I'd never heard of before—was the only one of the above that's got their designs in production. (They maintain no English-language web presence, but have distribution through independent channels, like this one.) The GT20s run in the $1,300 range.