The Qix looks a nice bike but what really justifies the price over other 8 speed derailleur based folding bikes? Is it just the vertical folding?
To be honest if I'm spending that much money I'd really want hub gearing. A derailleur is not ideal when so close to the ground getting covered in dirt and mud and more likely to get damaged, hit kerbs etc and need more maintenance. Normal size derailleurs always look like a compromise on small bikes but at the Qix price you shouldn't really be dealing with such compromises.
Also what the hell is dalloy tubing?
http://dahon.com/bikes/qix-d8-2/
Just seems like marketing b**lsh*t combining the word Dahon with alloy in order to sound innovative. I totally understand people not going for the more expensive Brompton but don't understand so much why you would pay extra for the Dahon over many competing 8 speed folding bikes of a similar quality at much lower prices. Many of which have higher load capacities and better components or better value for the same components.
Also the hinge on the frame. The standard design hinges horizontally because that gives the hinge the greatest surface area to weld to the tubing. It's the most logical design for strength. The vertical fold has the hinge on the thin section of the tube surely the weakest design. Just seems like a design most likely to fail and maybe innovation with a quality and safety sacrifice? Why hasn't anyone done this before well the answer to that seems obvious looking at the Qix. I can see on face value it may look safer having the hinge at the bottom to prevent the frame from collapsing if it becomes loose but beyond that for long term reliability and strength doesn't look so good in my opinion.