Even though I own no foldable cycle, I believe they are a very good idea, a solution to real problems. I almost (well, no, not really) got a job in a company outside of town, and commuting there with a bike would have been crazy. However, I can get close enough with our excellent public transportation's local train, and then hop on a folding bike and continue. People in Helsinki will know this already: if you go into a local train or metro with a bike, your ticket is going to cost you somewhat more than usual. Not so if you fold your bike.