I went on vacation to the beach once and wanted to ride but it was such a hassle to rent a bike that I didn't. I then decided to get a folder to take with me on vacation. I've flown twice with it and also take it in the car to go riding after work without going home first or to go into NYC for rides. My wife also has one and she doesn't like to ride on the road so we go to local trails to ride.
I bought a cheap folder to start just to get a feel for them and then went to a specialty shop to test ride a few. I bought a second one to have for visitors.