Trust me, I actually saw one of this, it's soooo iPhone4 alike, really can't tell the difference from look & feel.
If not hands-on to further experience the navigation, I would really think it's a iPhone4 for real !!
More online information here:
http://www.sophone.com/
http://micgadget.com/10605/2010s-best-iphone-4-knockoff-the-sophone/