I have a Dahon Speed P8 which I use as a part-time commuter. It rides like a normal bike and the 20x2" big apple tires soak up the bumps as well any road bike. It's a little slower than my main commuter (about 10% slower), but it's really nice to be able to fold it and put it in the trunk of a car or bring it on a train. I've ridden it up to 30 miles at a stretch and could comfortably ride it further.