Rumor 1 - Party Chat is broken and will take months to fixed.
Rumor 1: Party Chat give you a lot of performance issues and crash games/apps... it is really a bad implementation right now... MS already stated they are working on it... new rumors? MS is creating a new Party Chat feature to be released in mid 2014 that will be a separted app to not conflict with any other app or OS... I ask you why they disabled the Cross Game Party Chat? You will get your answer.
Rumor 2: It is... if you contant use the features like Party Chat.
Rumor 3: Yields issues with delay after dealy and way low shipment compared with PS4.
For now it a 3x0.