[flurpitude]

In my experience, having installed Windows 10 on 7 computers so far, Windows 10 has been unstable and full of small bugs. From blue screens and freezes to missing drivers to blurry fonts to the File Explorer failing to open or taking a couple of minutes to open, there seem to be common bugs at all levels and not much movement on Microsoft's part to fix them. The design is opaque, with settings scattered between two quite separate areas (Control Panel and Settings), and the start menu is less functional than the one in Windows 7 (for example, the frequently used programs don't really seem to be your most frequently used programs, and the tiles are a waste of space and hard to organize). The upgrade advisor will recommend that you upgrade even on machines where crucial components will be missing drivers after the upgrade. In several cases the upgrade has taken me from a stable, functioning machine to an unstable machine with some non-functioning hardware. Windows 7, by contrast, has felt stable for years, and even Windows 8.1 felt more stable than Windows 10. Add the concerns about MS's spyware and it's not hard to see why users don't want to upgrade.