I have been with Windows Phone for 5+ years. It all started with the Samsung Focus in 2011. I remember loving the phone and the interface and feeling like I had something unique in hand when using Windows Phone.
My next windows phone was a Lumia 928 which is the phone I still use as a daily driver (currently on W10 after going through all the updates 7, NoDo, mango, 8, 8.1, etc.)
Unfortunately, my time has come to an end. W10 runs well enough on the 928 but as is common knowledge, still feels half-baked. What drives me away is a combination of software and hardware. I constantly miss SMS notifications (I'm assuming as a result of W10), my phone has restarted multiple times while trying to make phone calls (which makes me doubt its reliability), the lagginess prevents me from actually wanting to use my phone, the camera performance is abysmal, my lock button sometimes works and sometimes doesn't (hardware issue). I simply don't have a reliable phone that I enjoy using. To add insult to injury, I am on Verizon which offers no other Windows alternative for me.
So for the time being goodbye, a Galaxy S6 will become my daily driver. I hope in 1-2 years the platform is still alive, has improved, and I have device options with Verizon.
Tis a sad day indeed.