My experience with Windows Phone
I had a Samsung Focus Windows Phone 7 and really liked it. After 2 years it was still working perfectly and did everything I wanted it to. The app ecosystem sucked, but as a "first" attempt at mobile (at least modern smartphones), I was really impressed. I saw great things coming for WP in future..
When Windows Phone 8 came out, I took the upgrade and went with the Nokia Lumia 920.
I was disappointed that WP8 didn't solve many of the problems with 7 and the ecosystem is no better. Even worse, the phone started falling apart after a year, constantly saying I had no sim card, audio dying all the time etc.
In the end, I just switched to an iPhone 5S. The first apple product I've bought since the 3GS.
I really, really wanted to like Windows Phone. The idea of an ecosystem of Windows on my PC, Laptop, Tablet, Phone and Xbox is really appealing to be. But unfortunately WP8 and Windows RT are not improving nearly fast enough given the competition. The ecosystem on both sucks and it's going to be hard to convince developers to target devices with such low marketshare.