I hate it coming to this because I like Windows 10 but feel forced to no longer support the free upgrade. Here is an article from Windows Central outlining several minor reasons why not to upgrade. My reason is a bit more substantial.
Since upgrading my device will come out of sleep on it’s own and go into an unusable state. This then leads to a forced, hard-shutdown with the power button and, as you should know, this is not healthy for Windows or the device. Since this machine is either being used or in sleep mode this instability is unacceptable and I would rather regress back to the stability of Windows 7.