My issues: Post Portico
1. Bluetooth in car radio. I have aftermarket Pioneer and phone will   connect, no freezes after the update where it did before. However, I   have to put in the pair code every time. My old 900 never needed to put   in the code except the first pair. My bluetooth headset works fine.
2. Brightness on auto. Notice this happens in a dimly lit room more   often. Tried the dark room calibration to no avail. Also, display does   not reappear during phone call when pulled away from face. Noticed   blowing into front camera near the sensor brings it back. This is   definitely a sensor calibration issue.
3. Random battery drain. I've tried battery discharge and that seemed to   help a bit. Still having drain issues on idle. I'll go to sleep at  100%  and when I wake 6 hours later, I have 96% with Facebook app  installed.  If I delete Facebook, i'll wake to 100% after 6-7 hours of  sleep.  Settings are: no toast, no lockscreen backgrounds, no chat. Only  things  running in the background are Accuweather, Battery Status, and  The  Weather Channel.
Still have the Xbox music playlist/app sync issue, but that's a whole other can of worms...
If these things didn't exist and there was Instagram and Pandora apps available, constant battery reports instead of 30 minute updates, ability to drop down the battery level anywhere, actual sync to W8 that worked, inability to view/click on certain elements in Internet Explorer, (sites  like Academy Sports and Wal mart where you try to enter in a zip code to  find locations do not work), inability to view animated GIF files  outside of the browser, (i.e. messaging app, in photo viewer, etc.) this might/could be the baddest phone ever.
Until then, i've debated going back to the darkside. Can't imagine how others feel.