For several years I thought the investment of US$1K+ on a folding bike was silly. To avoid that path, I tried a Giant Halfway, a Giant Halfway FS, a Downtube FS, a Downtube Mini, A Dahon Curve, an upgraded Curve SL and a Super Merc. The only thing that I ended up avoiding was a good bike to ride and an excellent bike to fold.
I am not married to my Brompton, but I am yet to find something that can match its qualities. Even with the super power of unlimited budget, there is nothing out there that can be a better fit for my needs.
+1. Dahon Hammerhead, Downtube FS, Downtube Mini, Merc, Speed TR. All good in their way; and I have a strong fondness for the Dahons. However, my Brompton is the one...