So steel vs. aluminum....I recently picked up a Dahon Mu Uno and it will be my lock-it-up on the street bike when I go places I can't take my more expensive Bike Friday Pakit indoors, but I think it also will be my wet weather bike. The single speed is easier to clean up after a muddy ride, and the coaster brake is actually pretty good in the rain. Otoh, my Pakit (which is steel) is a much more comfortable ride and the bike I choose for distance or any decent weather rides or rides which require gears. So I think "preference" depends on riding conditions...