That's a lovely looking bike. The Brooks saddle really finishes it off.
I still cant make up my mind if I prefer the brazed finished over a painted one, given I have a the X model I don't think a brazed version would look so good with Ti frame parts back and front.
I have since fitted an after market Ti post and the new Brompton brakes which are so much better. Mine also has a tiny 1.4kg hub motor on the front which increases its carry weight to 11.5kg all up. More details on the
Bromptontalk Wiki link.
Regards
Jerry