This build certainly seems a lot more stable than previous releases. The lock screen bug that was in present in the previous releases has been fixed as has the issue preventing Win32 apps being launched. The start menu now has a translucent effect in desktop mode and tiles now have a 3D effect when updating. Cortana has been improved as tablet mode, the whole experience feels a lot more polished and complete.
In this video I take a look at the updated start menu, tablet mode, Microsoft Edge browser and other changes to the OS. If you want to see how things have changed checkout my older Windows 10 videos on Youtube.