To add a couple more non Bromptons to the mix; a few years ago we thought a second hand folder each would be useful to take in the car to places where my wife felt comfortable cycling. In my case, I found a Viking Safari which has been a bit of a hidden gem. It was a 6 speeder initially. Having ridden it a fair bit (at that time I could commute the few miles to work) I was impressed with how well it went. I converted it to 7 speed with stuff from my bits box and found it surprisingly comfortable.
I thought that if this is how a relatively cheap folder goes, how much better would something like a Dahon or Tern be? I kept an eye out and eventually a Dahon Vitesse D7HG (I think that was the correct designation) came up with a Shimano Nexus hub gear. There had been no bids by the end of the auction so I put in a bid thinking, surely this will go for a high last minute price. It was not advertised as well as it might have been, and surprisingly I won it for the starting price.
It had not been used much, and initially I was almost afraid to use it in case I scratched it or got it dirty! The frame was very stiff and I was surprised that it was rather unforgiving on bad surfaces compared with the Viking. Also as Smudge has commented, the clamp on the handlebar stem was tricky to get its tension right, and I was worried that the bars would loosen unexpectedly, especially after folding/unfolding. Although it was a much better folder than the Viking, the Viking had a fixed length handlebar stem which made it more confidence inspiring in that department. Anyway, I decided to give them a few weeks fair trial with back to back commutes to work. The folding for me was not 100% critical, as I found that the Viking would fit in the car with the handlebars folded and seat pin removed, alongside my wife's bike. I did not need to fully fold it, though the Viking is small enough when completely folded to fit on a train as luggage. The Dahon is quicker and easier to fold, and probably just better thought out.
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The Dahon had narrower tyres than the Viking, Schwalbe Marathon Racer 1.5 in so I experimented with tyre pressures with no real effect. I had a pair of Schwalbe Big Apples in the garage (20" X 2") so to level out the playing field I put those on the Dahon. They improved things but not by much. The hub gears were the best thing about the Dahon. It also had a nifty pump built into the seat pin.
On my 3 mile trip to work I had to travel down a long traffic free hill to river level, then up a short climb up the other side, then a more gradual climb for a mile or so. Then back the other way, downhill to the river then up a very steep short sharp hill and a long gradual climb for a mile and a half, after a twelve and a half hour night shift. Both bikes coped fine with this, but it was the Dahon that gave me numb hands. The Dahon felt a little cramped compared with the Viking, which allowed me to stretch out more, even though the wheelbases were virtually the same. I knew that one of them would have to go, but I was reluctant to make it the Dahon, as it was theoretically the "better" bike. Anyway, I resolved it by riding them both a decent (20 miles or so) distance over the same route on different days, first the Viking, then the Dahon.
So the Dahon went back to its original tyres and was sold to a buyer, who was very pleased with it, and the Viking is with me still. It was an interesting experience. And unusually, it didn't cost me anything, as the outgoings and incomings balanced out.