I enjoyed the Curve D3 a lot.. very compact fold and rode very well .. when I had mine, they were in very short supply and someone wanted it more than I did .. and I had a project in the works .. if you are just looking for a simple bike for the trunk and relatively short distances with minimal hills, a single speed would easily fit the bill.. I currently have a Mu Uno which I used as a single speed happily and then converted it to a 2 speed.. coaster brake, no cables to the rear, compact fold with handlebars folding between the frame halves , excellent ride... the bike lives in the small trunk of my Alfa Spider and gets used in hilly Marin county regularly.