I know that but if you make your whole gamertag 0D it comes up as blank. I have one that is all 0D and it's blank. Plus, if he wants a blank gamertag, why would he put letters in it?..
X31's, as stated before, run through batteries quickly. Plus the cord connecting the headset to the controller comes out a lot. But they do work great. The sound is great. I would reccomend the X31's..