...I bought the dahon curve d3 ... If I had a 20" dahon I would consider the brompton, but I have something so similar I wouldn't bother...
What's so similar? Sure both the D3 and the ML3 have three speeds and about the same gearing (supposedly, according to Dahon's site quoting 43"-81" and the Brompton's standard option being 44"-79") but that's it.