Yeah, recently I've been thinking about taking a XO S since there's some exclusives that I'd like to play, but so many things are a joke in this console... :/ And the "no headset sorry" is one of the worst to me. I've always LOVED the MS headsets that they included with the 360 and the XO, it was "cheap" but it was working just fine, confortable, no need to buy something better (again: to me), it was really cool having that included... When I heard there's no headset in the box, I was very very disapointed. I thought that "crappy headset" included in the PS4 packs was the worst thing to do, but no.
That and the fact that they didn't fix this f***ing voice chat issues since day one... WTF are you doing MS? I remember buying a XO over a PS4 day one, for a friend addicted to MS and for Dead Rising 3 and everytime we were voice chating we had the EXACT SAME problems than OP! Since then I sold my XO and I heard a friend of mine saying that the he still has the same issues with the voice chats and yes it seems to still be the same since day one... Unbelievable.
I also heard that the new UI was not better than the first one, still damn slow and yeah it seems to be the case...
The 360 is one of my favorite console ever, I remember buying it day one and directly voice chating with my friend without any problem for hours, with the INCLUDED headset... Never had any issue on X360 (except 4 RROD, but it's a different thing...).
Well, MS must be too busy to congratulate themselves on twitter, to think to fix the flaws that the XO has since day one. Will wait until I can find a 99 XO (won't be long: already spotted brand new at 180 on sales) then.