Search this forum, bluejeff has a fantastic article on spotting fake racquets, can't remember the site URL, but it's in the forum somewhere. Lots of articles scattered around this forum so just search. It's up there in a blue bar above the advertisement from google. ~Cheers
Here's the thread, which including BJ's other sites: http://www.badmintonforum.com/vb/showthread.php?t=15203