"If you plan on riding 10-15 miles EVERYWHERE and want your bike with you as your best friend, Brompton."
That pretty well sums up how I made my choice. Frankly, I couldn't stand the Dahons I tried. I liked a couple of Birdys (Pocket 8 stands out) but I wanted the best fold and a good ride and after testing a Brompton in hilly El Segundo, CA that's what I bought. It's always in my rig ready to go. Not long ago I did a 20+ mile ride on the Boise Greenbelt and it was just fine. I ride for fun and exercise and the Brompton gives me loads of each. Adding a B-17 saddle, Ergon grips, and using the stock tires and it was plenty fast and comfy for *my* needs.