I agree mostly with Wavshrdr but I would like to add some more thoughts on folding bike selection. One of the strongest points by which I made the choice of purchasing my Dahon was being the largest corporation that makes folding bikes today. I felt that the longevity of the corporation's survival in a increasing cutthroart enviroment of disappearing bike makers made me confident that it would be around for a while and I will probably be able to get parts for the bike in the future as needed. Plus it has a more compact fold over the Bike Friday, Downtube and some other 20" folder size makers which is critical for me when I commute and travel. My Brompton was purchased in the same vein even though the maker is a smaller one in volume of numbers of units produced.

Remember to test ride and actually fold it up before you purchase to get a good idea if that bike is good match for you.