No it's not, it worked just fine for me 10 minutes ago and I've just used the code on my psn account - Thanks op. (y)
This deal has now expired.
Cd Keys has it for the same price.
Just buy from electronic first or cdkeys if your worried about the legitimacy. They are all basically the same price.
Done this through instant gaming just now, they asked for photo ID after making the purchase, I uploaded this to the site and they verified the payment and sent me the code in less than 5mins. The code has gone through on the store fine. Used it against a PS Plus 12 months sub.