I installed Windows 10 Technical Preview. Actually, I was so brave (foolhardy?) that I upgraded my main Windows 8.1 installation to Windows 10. The good news: The upgrade process went very smoothly indeed. The bad news: Well, except for a few small interface quirks, there doesn't seem to be much bad news. Read on for my early hands-on impressions of Windows 10 Technical Preview -- and a video of Windows 10 Technical Preview running on my multi-monitor desktop PC.