Recently, I got a folding bike. Its a Flamingo bike. Basically, its a Brompton-clone from Taiwan. I did want a Brompton but no dealer here and the price of bringing one in was a bit too much for me. When I found out about Flamingo, I researched about it thoroughly and decided to get one once funds became available.
This is my first folding bike so my review is based on the point of view of someone who came from a full sized bike. I was warned that 16" wheels will give a harsher ride. It was twitchy at the start but I was immediately able to adjust. As for being a harsher ride, I don't find it any harsher than riding an aluminum road bike. I do feel that you exert more effort but not that much. I don't ride fast anyway.
When I was at a shop, I folded my bike and a lot of people were watching. It seems that they are amazed at how this bike suddenly transforms into a small package with rollers. The process of folding took me around 1 minute but I noticed that experienced people take only 15 seconds. Can't wait til I get it down.
In summary, I love this folding bike. Expensive compared to a Dahon but I got it for the fold (takes around 1/3 of trunk space of my car). There are tradeoffs compared to a full sized bike but I'm willing to take them.