I purchased an Xbox One console on launch day and had an issue with my controller that needed a warranty exchange. I called in this problem and was informed that I had to ship my controller in, and within 15 days of receipt, I would get a replacement. I felt that this was unacceptable as the controller was within the 90 day warranty period. This also left me with the prospect of not being able to use my console until I received my replacement. I pleaded with every person I spoke with but they refused to ship a replacement controller prior to receiving mine. I finally capitulated and shipped my controller exactly as was requested by Microsoft on 2/19/14. Tracking confirms they received my controller on 2/24/14. Prior to shipping the controller I was forced to buy another one (that I didn't want or need) due to the estimate down time. I called twice to check on the status of my repair and both times they had difficulty finding any information on my exchange. I also reported a change of address on my first call. On April 8th I received an email saying my controller was shipping. It is also shipping to my previous address.
This is a warning to anyone who has a warranty exchange with Microsoft. DO NOT ship them your item first, they will burn you.