The Brompton is a great bike, as you have discovered. I've had my S6L for about 3 months, and in that time I've travelled on busses, coaches, and trains all over the country. It is easy enough to do, although it does get heavy if you have to carry it far. Bus drivers are sometimes reluctant to let the bike on, so the saddle bag cover thing is well worth having http://uk.youtube.com/watch?v=9ic6cssX_50 .

As to lights, I agree with you about dynamos, I use battery LEDs. The standard Brompton LED lights are better than nothing, but not great. I bought a set containing CatEye TL-LD1100 rear and EL530 front LEDs - they are much better, sufficient for riding in darkness with no streetlights.

The 6 speed gears give a reasonable range, though I wouldn't mind another lower and another higher gear, I can live without them. The new wide range 6 speed has bigger gaps between the gears, and I don't know if I'd like that either...

It is possible to carry lots of stuff on a Brompton:


I too prefer the more stretched out position of the S-bar, but it does limit front luggage options. The S-bag is small, no two ways about it. Perhaps the P-bar would be better, giving more hand positions, the lowest similar to the S-bar, the highest similar to the M-bar, and the full range of luggage... but it's just so ugly!