The posts in this site seem to make people believe that folding bikes are synonymous with Brompton, Dahon, tern, etc., and further down the line, such as Birdy, Bike Friday,....., and there are numerous others which fold and ride better than those big names. I like my cheap aluminum bike, GOAL GT1, weighs 10Kg, paid $85 brand new. This is a high quality product made in Taiwan (I have no relationship with the manufacturer). The link below is their new model, GT2.
http://goods.ruten.com.tw/item/show?21205104437065