I've owned X11 & X31, the 31s I got rid of for "hiss" noise & the lack of punch. It's a common problem with wireless headsets. Having batteries available can be a pain in the arse as well. Always remembered to charge them at first but as time goes by you will forget & it sux when mid-game the auto shutoff says hello. X11 are the cheaper/mid range alternative & have performed flawlessly since I got two pairs about 12-18 months ago. I was worried the sound quality would be a dramatic step down but I was surprised to honestly say there was no noticeable difference while gaming. (If there is in music listening I wont argue as I have seperate earphones for music.) I'd be very interested to see what you have to say in a month or so, in regards to any pop or hiss. With any luck you have none.
I've been a TB fanboy for ages, all of mine I had to import as no-one had them in Oz at the time, which meant paying overs but I was happy. Having now used the A40 & AXPro I have to admit that the A40 will be my next purchase.