It works! When you order, you will have to put in your phone number for verification. A phone call with a verification code comes quickly. Then just punch in the verification code on the website where it asks for it (when you try to download it), and the 12 month gold key code becomes available to you. I punched in the key code on the xbox, it was accepted, and another 12 months was added to my account.
I also used the 5% discount code for liking CDkeys on Facebook, but you must use the code within 23 minutes, or it will expire and you will need to get another one. Can't beat the price!