The dahon bikes seem to be viewable in riccarton, for pickup too. I might just visit them to take a look.

I recommend the launch d8 for the disc brakes because rim brakes are a hassle since the 20" rims wear out so fast from the braking.

The jaw hinge should be much more stable but I haven't seen it in person. But that's why I'm curious and will go have a look at it.