Cool to see this thread updated. I still have my modified Dahon Curve but thinking of selling it. I bought a used Birdy 3 used at a very good price and with some slight modifications gave it to my son to use. He's 14 now and the Birdy is growing with him. Just switched out the seat for a Poloqo. He's faster on it than I am on my Tern these days. Waiting to see if I can get my hands on a used Helix.