I'd tried the developer preview on a Windows Tablet PC, but that was a nightmare. This time I installed it on a Lenovo X200S, primarily to make use of the performance boost on this lightweight (<2.7lbs) but underpowered machine. It looks good so far. Performance does seems snappier than Windows 7.
But, the first thing I missed was that the built-in Fingerprint reader was not automatically supported, even though some others reported that it worked on their x200. Perhaps there is some difference between the x200 and x200s fingerprint readers. I dutifully installed the x200/x200s from Lenovo's website, it complained that it wasn't supported. I forced it to install under compatibility mode, but still no go even after several reboots.
Although this post is meant to be a review of Windows 8 or Bing, I have to mention this. I tried searching on Bing for "Windows 8 x200 Fingerprint" (without quotes). I did not get anything useful and most results were old from 2008 and 2009. Google did lead me to Lenovo's fingerprint software page, which did not mention support for the x200/x200s. I downloaded and installed anyway and it installed without complaints. I went in to Control Panel -> User Accounts -> Manage your Fingerprint data and I was greeted with the Lenovo Fingerprint enrollment screen. And it works!