Hello guys.I have a car,but the gps navigation is not working. so I want to buy a car one online. My friend recommended me to buy one from http://www.cargpsnavi.com/. i saw it,it is a Chinase Online store.the products seems to be at a low price.BUT i do not knew much about Chinese products.is there any anybody to knew much about Chinese product? or if you have ever bought products online,Please tell me.Because this is the first time i bought a products online.Thank you.Need your advice?