I have only just discovered folding bikes and am very excited to get one. Here's a used one I'm considering. Any thoughts? I think it's a 2006 Dahon Boardwalk. Since it's a single speed, I would like to convert it to 3 speed or more (depending on $ and gumption, since I've never worked on a bike, but I'm handy). I've read some reviews that the spokes break easily and that the frame isn't as sturdy as others, but not sure if that is for all boardwalks or for a certain model year. Any insight/advice would be appreciated.