I had a chance to ride a derailleur version of the Curve SL in Socal and was disappointed in it. For a bike about the same size as a Brompton, I felt it was nowhere near as good a ride. I talked to Thor about one and after our discussion, he sort of led me away from that model.

I think if I pull the trigger on the Brompton I'll get the 6 speed. For the extra c-note I'll have a little piece of mind and won't have the nagging questions as if I got the 2 or 3.