Was surprised to get Build 10074 successfully installed. I was on Build 9926 before this upgrade. Prior to this, those builds between 9926 and 10074 were annoying and frustrating failures during installation. Never thought I could upgrade to the latest build so neatly from 9926.
Now all my frequently used apps like OneNote, Excel, Calendar, MSN News, Money are working fine. Before, they can't even launched.
This 10074 Build is so much more stable and cool. However, the tiles in the Start Menu is very still very unstable and buggy in that they keep hanging while you are reorganizing the tile layout. Its as if Microsoft is deliberately trying to wean us, Metro fans, from the Modern UX to the pretty boring and monotonous Desktop UX. Overall, this Build is a great and substantial improvement from the previous builds.