Love the Book, but not too happy with the OS, yet. Since I got the book last week I have been noticing various problems with the file system. Here is a partial list (I should take better notes, but I did not sign up to be a beta-tester): When transferring files from my old computer to the new one via shared folders over the local net, if I tried to do more than two things everything slowed down to a crawl or complete stop. In the past I was only limited to the bandwidth of the path - silly to try to transfer more than 4 or 5 folders at a time, for example, but two?? When accessing files from an external 2TB My Passport (which I have been using with my old Windows 8.1 laptop with no problems), sometimes I have to wait 5 or 10 seconds before it finally opens them, even when using File Explorer. This slows down any program using the files. Once it is recognized, it is faster for a while. When trying to Import images in LightRoom, a few of them are imported and then the computer locks up if I try to Import them directly into my external drive - works ok to internal memory. This was reported years ago and found to be file system related, (although it is not good that Adobe doesn't handle it without locking up the whole computer, requiring a forced power off!). When I try to move files from internal memory to external drive using LightRoom, many of them transfer and then it stops, all other file functions on the computer stop working. Can't even open Windows Settings or Task Manager until something finally times out (minutes later). When creating a PDF from a DOCX in Word 2016 the file system once again locked up. After many minutes I finally killed Word using TaskManager and found my DOCX without any of the images that were in the document. After Googling I saw that this was a problem going back as far as Office 2010 and was caused by not being able to write the file back to the disk - once again pointing to a file handling problem. The fix back then was to have Word constantly back up your work. I am using this for serious work and serious hobby, but I am now seriously upset. I don't have time to spend finding and using workarounds.