I had a Bike Friday Pocket Rocket as my travel bike which was stolen (in-town Atlanta is a 24 hour crime wave). Instead of buying another one I had my 14 year old Litespeed Classic cut and S&S couplers installed by Stephen Bilenky. Honestly, after my experience with this bike I don't know why anyone would buy a folder. It is terrific. The first time I broke it down I tried to time myself but my watch did not have a second hand, so all I can report was that it took under one minute. My times have since improved considerably with experience!
Unless you are looking for the "Wow, look at me factor" the S&S coupler route is the way to go.