I've been a biker for over 50 years and decided to join the BikeForums because of the good information on folders; I'm about to buy one. Weather and road conditions permitting, I commute 11 miles each way each work day from Wellelsey to my office in Back Bay, Boston where I work as an architect. My current bike is a Specialized Sirrus set up for commuting. Originally it was a 2001 Comp but the frame broke (drive side chain stay) and Specialized gave me a new bike. That bike is a 2007 Sirrus Sport, but most of the running gear is from my 2001 Sirrus Comp since it is better quality. Given the truly crappy roads around here, I upgraded to a set of Velocity Synergy rims, 32 H front, 36 hole O/C rear with Shimano 105 hubs and custom built by Peter White in NH. He builds straightforward wheels with no gimmicks and life time free truing.
I'm in the process of researching a folder for when I travel by air; top choice right now is a Downtube FH (full suspension, 8 speed internally geared hub.)