Started to look at the racket and the serial number started with a "KY******" alarms bells so did the easy trick of opening the butt cap "boom" four nails instead of the normal staples, looked at the balance head heavy, grommets black instead of grey.
Broke the news to the owner (hate doing this) he purchased off the internet a while ago and paid full price.
So why are these fake rackets bad: here is part of an article from the Tennis Industry Association (TIA)
Counterfeit racquets can be dangerous for consumers to use, say manufacturers, who spend millions in research and development to find ways to dampen vibration that can affect the arm and body when the racquet strikes the ball.
“These knockoff racquets just aren’t going to work the same way as the real frames,” notes Eric Babolat of Babolat. “The inferior product and construction can cause harm to a player, and can definitely affect his or her enjoyment of the game. Also, the fake racquet won’t have the durability that legitimate manufacturers build into their products.”
Also the sellers of these rackets are ripping you off and smiling whilst doing it.
Advise: only buy from an authorised dealer, if the online deal looks too good to be true it is!