I bought a Dahon Formula S18 from Amazon about a month ago. It was shipped free 2-day because I'm a Prime member. The bike arrived with one of its wheel reflectors broken, a minor problem. I briefly chatted about that with Amazon rep, who was very generous in accommodating me.
PROS
* Excellent quality and finish.
* Fast and fairly maneuverable. Generally quiet.
* Aluminum frame is light. Folds quickly and compactly.
* OEM sticky tires provide plenty of traction on pavement, even when wet. Seem tough. No flat yet. 80 PSI good.
* Disc brakes provide excellent stopping power.
* Adjustable handlebar height allows for desired posture.
* Handlebar grips are excellent.
* Rear derailleur works well. Front derailleur only OK but I don't use it much. I keep it on low gear.
* Adjustable height seat is hard and somewhat comfortable, not cushy.
* When folded, allowed on my local public transit, any vehicle, at any time, no extra charge. Also easily fits unfolded in bus rack.
* The handlebar and seat position adjusters hold well, if you set the right tension.
CONS
* On arrival the front derailleur was out of alignment/adjustment. Easily corrected with hex key and screwdriver *if* you know what you're doing.
* When you pedal vigorously, the frame creaks. Haven't localized the flexure yet.
* Magnets on the wheel hubs are supposed to keep the bike folded, but they are not strong enough.
* The bike cannot be rolled when folded. Must be carried.
* Even with 18 speeds, would be nice to have an even lower gear for steep hills.
* The slick tires would be risky in winter snow/ice. Also, up to pressure, they slip in deep dirt.
* Not much room on bike for accessories. They tend to get in the way during folding. I did mount a headlight and bell on the front handlebars.
* When bike is locked in public, the seat could be stolen in two seconds. My cable lock cannot fit through the seat. I had to buy a seat leash.
* When bike is folded, the front gear is exposed, which could poke someone or smear grease.
* No chain guard so need rubber band on right pant cuff.
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