If I were to buy a folding bike I would ride one first. I bought my Xootr Swift after reading volumes about them but I was already folder savvy from my Brompton and that helped. When I bought the Brompton I also rode a Bike Friday Companion and then the Brompton. Probably would have bought the Bike Friday except the Brompton felt so much better. I have no reason not to believe the Brompton will last for a long time, as it is over 3 years old and I have ridden thousands of miles on it. Gone through several sets of tires, brake pads and chains, nothing else has been an issue except I replaced the headset with a Chris King Gripnut after about a year. Wasn't cheap, but for a quality well made bike it was very inexpensive. I believe in buying durability and quality once and don't need any short life products which need to be replaced. Obviously you will do as you think best and best wishes on whatever you get, but at least ride a Brompton first. Ride the others too, and if you get a used one of whatever you will have a pretty good idea of what shape the used bike is in.