The title and link do most of the talking, but MS have tinkered with the controller. Not sure why, I think the controller is fine, but this Autumn/Fall, we'll have a new piece of hardware. Now if only they'd make a wired version.
Please let old threads die and do not reply to them unless you feel you have something new and valuable to contribute that absolutely must be added to make the discussion complete.
Otherwise, please post a new thread in this forum instead.