I just thought you could think for yourself instead of acting as if the only thing in the world is the Mfg's claims. Moreover, since y'all have the big fancy hardware expert website, I thought perhaps you could justify using ping as a measure of latency. So far, all you have been able to say is "that is what everyone else uses".
And I don't know why you cannot follow my posts, but I have suggested that I am not convinced that you are measuring the right things. I want you to see if it reduces lag in games. It shouldn't be that hard to do some actual research and talk to someone other than Bigfoot about how a few games use the internet and see if it makes a difference. From my point of view, your tests do not test what you claim. In fact, several posters have made some interesting points that could be explored.
Now if you just want to leave your review at "the Xeno does live up to the Mfg's claim", that's fine. Nice work. I thought you would want to press further and try to understand if there is a benefit that is not captured by ping times. Finally, it would be really interesting if you tried to figure out why companies like EVGA and Alienware would sell a product that does not do what it claims.
In the end, you argue that card is as good as QoS software. That claim does not seem to be supported by your data. Your data does not contradict it, but it is insufficient.And when I raise issues with your methods, your retort is "well the Mfg says blah blah". When it seems you could concede that a margin of error remains (which, ironically, you do in your review).
So here is a simple test that would satisfy me. Get three machines. Two with Killer Xenos (one in app mode and one in game mode, both in the DMZ running FNA Forewall) and one without (people on several sites are calling for an intel pro card, matters not to me). Have three people play on the same server of the same game. Measure ping times and record the game play. Then have the players rotate machines (blindly) and comment on each. This should at the very least show that if there is a benefit, then it is not discernible.
Now you can say that test is too complicated and too expensive. That's fine, but that is what it takes to make the claims you are trying to make.