I’ve had access to it for a while, but just got around to installing it. The good news is now anyone can now because it became public today. The install experience went very smooth and I haven’t had any problems since installing it (earlier today). I developed in VS2008 all day, used Outlook, browsed the web with IE, etc. YMMV.
Keep in mind this is an RC and not RTM, so you will have to uninstall/re-install when it does go live.