I installed the preview on a test workstation at work. Even though it's still really fresh, I like it. Being able to remove the live tiles from the start menu gives it a more 7-ish appearance. We're going to skip deploying 8/8.1 on our network and wait for 10 to be available commercially.
I hope the release of the next Windows Server OS follows the appearance guidelines of Windows 10. RDP to server 2012 with the 8/8.1 Start Screen isn't the greatest thing I've done.