Has anyone heard of this? My surface pro 3 battery died - it will only power up with the power supply and does not charge the battery. I called to see how much it'd cost to replace the battery. They told me $599US, but that they'd provide me with a surface pro 4. They said they'd do the swap at a local MS store. Have any of you heard of this or done this before? I wanted to get your opinion whether it'd be worth doing it - I also wonder whether this is an actual thing or whether the service rep was feeding me a tale (I have had bad advice from them before). I don't want to waste driving an hour to the MS store if this is not a real offer.