Almost 2 months ago I did an upgrade from Windows Phone 8.0 to Windows Phone 8.1 Preview. More about that can be found HERE. At the moment there are multiple updates installed after the upgrade (which is 8.10.12397.895 now), but still there are issues left. In my case on a Samsung ATIV S device. Beside of the issues I'm still very satisfied with the new features. Let's have a look at issues solved already and issues left.
-Battery drain, I'm doing over 30 hours per battery load now.
-Reboot when using Bing Music or Vision, seems to be working now.
-Share blogposts to Facebook, but Twitter cannot be found.
-When switching from camera to video and start video capture. Switch back to camera after that and the screen will be black. The device must be rebooted to have camera working again.
-Also camera is taken photos with Flash while disabled in photo settings. Oops!
-Multiple unexpected reboots when using my Phone in the car connected with bluetooth. Also during the day when not connected with bluetooth.
-Share blogposts to multiple apps like Twitter isn't working anymore.
-No Cortana can be used because I'm living outsite of US. (pity)
I really like the new start screen with way more Live Tiles then before. Also the Action Center, Notifications (per app), Agenda (advanced), and Background on start screen are all great. When using swiping for keyboard you can create messages way faster then typing it. No way I go back to Windows Phone 8.0 ever. Microsoft did a great job on new features in the Windows Phone 8.1 Preview!