I have a Dahon Vitesse with Afline 7sp and it’s a most excellent tool. There are many differences between Dahons and Bromptons and you’ll either be in one camp or the other, I sit in the Dahon camp. I find Dahons are way more sturdy, can take a decent peddle stroke and transmit it to the rear wheel, they can carry a decent weight of handlebar bag and rear panniers and also, lastly, fold neatly. Yes ok they’ll never fold as tightly as a Brompton, but then you can still get them folded and tucked away in between train seats and or in between your legs (as I do). I take mine folded into shops and have never been told not too, this is a boon in Larndarn where I do not carry a lock because there is simply no need when you can take it everywhere. The only place I’ve been refused to take it in folded is one Office I worked in (briefly) where the swipe gates had glass over the top and I had to lift the bike almost over my head as the gates were incredibly tight.. but everywhere else, restaurants/bars/Waitrose/clothing shops I’ve always been welcomed. Thing with Larndarn now is, most commute/transport by bike and it’s accepted, so the stigma of folding bikes has almost ceased.
As for fitting taller people, well you can get stems to fit them with ease, seats can be rammed back on their rails but changing the post could be difficult as it forms part of the pump, but I guess you could fit a layback on it but then you wouldn’t get the full fold effect.
I see lots of Birdys, Dahons and other brands on the commute/riding but if I have to be honest I see more Bromptons, but then they’ve always been a Lardarn thing I guess.
Dahons are a bit expensive, I paid £900 for mine, but then I chose what I wanted, you can get them cheaper, less gears etc. but I paid for the sturdyness and ease of fold.
HTH