Hello... I'm a new Surface Pro 3 owner, and I have downloaded the latest release of Windows 10 Technical Preview (Builds 10074). So far, I've had very few issues other than Windows Mail occasionally shutting down if I click on a link within a message. The pen continues to have full function, including opening One Note when I push the top button. I hope to gain valuable information from this forum as I continue to use my Surface Pro 3 with newer versions of the Technical Preview.