I just picked one up the other day. I know that you can block users, and set the locale. I will say that since i have been using it, i still get some red bar games....but they are so much better than normal. I am a very competetive player and can say that there is a difference when using this product. My kd is typically a 1.3 - due to trading with shotguns, and playing laggers. With the Net-duma, i have been averaging a 1.75-2.0. It is worth is once you get it fine tuned. Since using it I have been getting error code beaver more than normal. Net-duma has been very responsive and helped to reduce the errors. I can say that it is worth it once you fine tune it.