I have been hiring a Brompton folding bike every time I go to London and, I confess, lusting after one for years. Last week I finally broke down and purchased one and... love it!
Number one: It is a great way to get around. Saves gas, energizes me, it just is a lot of fun.
Number two: Everyone loves it. In Chicago for the National Restaurant Show this past weekend - Folks at the booth next door made me open it up and wanted me to ride it in the show.
At an outdoor cafe, I actually received a standing ovation for folding it up! (Granted, that table had had quite a bit to drink...) On the street I was asked at least 5 times, "where did you get that?"
Anyway - get a folder - too much fun!