Liking the preview, once I got it properly installed. Upgrade from Store sort of worked but was giving me audio services issues. Decided to do a fresh ISO install instead. Interesting enough, had to use given ISO Product Key when I did ISO install but was able to change it afterwards to my legit Windows 8 key and activate. I would be assuming that this would be the issue with the RTM upgrade from the preview for Microsoft. Time will tell. Right clicking the start button on Task Bar brings up a good many useful options and also the new layout in Explorer, "This PC" has everything nicely on hand. Still had audio issues with ISO but wondering if it is due to my use of AMD 13.4 WHQL drivers which might clash with HDMI Audio Driver and my RME Babyface USB audio device. It's a little flaky but can be worked around with a boot up by disabling AMD audio, unplugging the Babyface then clicking audio icon on taskbar to start audio services. Finally plugging back in the Babyface. Hopefully sorted with more recent updates/release.