I have a bike just like the one Ringo writes about. I bought mine on Ebay from a chap in Wembly. It had one or two tiny adjustment issues, but having ridden it about 18 miles in the last couple of days, it seems pretty good for £110. It looks exactly like the one in the pictures here.
One thing to note about these copies is that you can not generalise about their quality. A quick search on Google brought evidence of at least eight factories in China producing Strida 5 copies. The one I and Ringo have seems to be on sale to importers for US$94 per item with a minimum order of 20 bikes.
http://strida-bike.china-direct-buy.com/
Mine is stiff, handles predictably and feels pretty safe once you accustom yourself to the quirky handling engendered by its geometry.