I was searching for Halo keys on ebay (for a friend who wants to play with me online).

I came across this.

I also went on their website.

They have a 99.8% approval rating on eBay. They also have some customers (in their feedback profile), that shows that the product works (though one customers complained they couldn't get on live [but he explains this wasn't the sellers fault]).

I wanted an opinion on the legitimacy of the software (though, from their description on their website, it does seem like it could work).