I got a Brompton folder a few weeks ago and have started commuting to work some of the time. It's an adventure that involves catching two trains in between riding 20 miles a day through Los Angeles and Orange Counties. There is a gritty urban highway section over three miles long that requires riding on the sidewalk almost all the way but for some reason I enjoy that part. The little Brompton zips along (well, at least in the morning when I have more energy) and then turns into a small package to fit on the train. One thing I learned was to bring a lot of food to work because you need more calories. The main challenge is that the entire commute takes more than two hours each way. I work at three different locations, all between 60-80 miles from home, so the only fast way to commute is on my motorcycle. The consolation prize though is getting some reading done on the train, and of course getting lots of exercise!