Pros: Light weight, easy to ride, smooth
The Dahon Boost electric folding bike is the first venture into electric bicycles for the folding bike gurus at Dahon. That being said, I'm impressed with the way the Boost responds! It's a completely pedal-assisted electric bike, which means the motor only responds to pedaling. There are three preset speeds the motor can be set to, and a controller on the handlebars can set the speed, turn on the lights, or turn the electric motor off to pedal the Boost like a regular bike.
As far as the bike goes, it has the same folding dimensions as other 20" Dahon folding bikes. It's about 40 lbs, so it takes a bit of effort to carry it, but for an electric bike, it's pretty lightweight. There are three internal hub gears, which has enough of a range to handle most hills. Combined with the three motor speeds, there are nine settings to pedal this bike in. It's pretty versatile.
The rear rack is actually welded to the frame, so it can carry quite a bit of weight. The step-through frame is also nice because almost anyone can ride the bike, no matter how short they are.
Though it has a limited release, you can buy the Dahon Boost at NYCeWheels in New York. They ship to anywhere in the continental US and Canada.