The design isn't unique at all - there are at least two other brands with almost identical folding designs sold in Hong Kong.. Graco is one, I forget the name of the other. We found little difference in price, quality or design between them so ended up choosing the one my wife liked the colour of best.
The urban one I had folded even tighter than the regular Combis and whether it's "unique" or not is really not the point. The point is that it folds up small. We have a different style of Combi now that doesn't have the same fold as mine did. Yes, there are lots of other choices out there but I have never found anything as light and flexible as my Combi urban was.
Also, Graco, to me is even more bulky than I like because I live a 20+ minute walk from "civilization" and the only way in and out of where I live is one small infrequent mini-bus that people are scrambling and pushing to get on because it's always packed--so for me, something very, very small and extremely foldable but sturdy and durable is what I needed. At the time I was doing everything solo and had really severe back problems so I needed something light.
I'm guessing people who live in the city and mostly are on well-paved roads (some by us are not paved) and going in and out of the MTR won't really find any of this an issue.