We just got them a few months ago. Bromptons are "one size fits most". The majority of adjustment is the seat post. You can't adjust the stem but different bars will give you more or less reach. So mine's a flat bar while Knott has an "M" bar to accommodate her longer wingspan.
We got the bikes primarily so if we want to do a day trip with riding we can just toss in the car and go. No rack, dissembling the bikes, worrying about them being visible etc. Just be able to go anywhere and fit rides in.
So far we've tootled around here and they are fun. Slower and less comfy than any of my regular bikes but great at what they do. And you can fly one up and just bring it into a cafe or pub.
Make people smile when they see them. A typical reaction on the trail is when kids see the Bromptons they may point and laugh. I get it, looks like a clown bike.
But the parents, they want one!