ft - Always inspiring to watch... hill climbing can be it's own special kind of addiction.
And yes, last winter in Portland was wet and while there I ride a folder and have a good time climbing up and down all those hills and passing hipsters on fixed gears.
My folder here is a vintage 1973 Phillip's 20 which has no issues climbing any hill as it has been refitted with derailleur gearing and a wide range for touring... would suggest 20 inch wheels as they give a much nicer ride.