I've had my Brompton now for about four months. I can safely say it is a fantastic bike. Unlike other folding bikes it is a joy to fold and unfold, and the folding sections feel rock solid when riding. You do not notice you are riding a folding bike. I've had two Dahon's and while they were both nice, and competitively priced, I rarely folded them. The Brompton I fold and keep under my desk. It is also fantastic for taking my five yr old son places. He simply stands on the back rack and hugs me as we trundle along the sidewalk slowly. Fortunately, I don't have a big waist line, so he can peer around and see where we are going. It's a lot of fun.
Alone, it can hold its own on the street, and with the beautiful SON hub dynamo, and B&M lights front and back, it's a joy to ride at night without having to worry about batteries or even thinking about switching the lights on, as they come on automatically when you ride at night.
The bike attracts a great deal of attention, and I try to make a point of talking about it to anyone who asks. These Bromptons really are top of the folding heap. Even my bike racing friends are surprised at how smoothly this bike rides.
A few points:
1. Its three gears are very well spaced and I have never felt the need for the six gear model.
2. I reccomend the model with a rack, for three reasons. (1) you can attach a rear light (in fact it comes with one); (2) it has wheels that make rolling the bike easier (which make it as easy to push around as a small suitcase trunk); (3) you can carry stuff...(including another Brompton bike, they are that small...)
3. For those of you who care, I have found it difficult to pull a trailer. My Burley trailer attachment did not work, because of the way the chainstays on the Brompton are bent. The alternative hitch does not work either. I did devise my own attachment, but trailers work better on hardtail bikes anyhow, so I've stopped using the trailer with the Brompton (which has polymer suspension).