This is a new folder that I found that is quite affordable for a folding trike $1575. Check out the links above and you will see how compact the little thing actually folds. I am quite impressed with what they are able to offer at that price. It looks like we can thank Mexico for the price break.
Some guy in Santa Cruz, CA has/had one, and did not like the quality, from what I remember. I think he said it wasn't stiff enough when put into trike mode. You may want to see if they offer a money back guarantee.
If folding trikes are your thing, I think, on paper, Greenspeed offers the best bang for the buck. HP Velotechnik and most other competitors are way too cost prohibitive or don't import to the US. You can also get a fairing kit for the Greenspeed and turn it into a ghetto velomobile for another grand.
Yes, my favorite feature is the disappearing wheel when folded. If they could sell their patent to Dahon, they could make a fortune. I also quite like the bizarre shot with the cheerleader coming out of nowhere.
It would be great to see a bent bike that could actually fold like that though!