I got the update (Software Version L720VPUG0D2, Android Version 5.0.1) last Friday on my Samsung Galaxy S4 (SPH-L720) with Sprint, Eastern WA area
A few issues I have had so far, may be bugs or just changes that are annoying, lol.
1. The option to set the phone to Vibrate, if you long-press the power button, isn't there anymore, if you long-press the power button you get Power Off, Airplane Mode or Restart but not the Mute, Vibrate and Sound choices you used to get. Now you have to unlock the screen, open the settings and scroll through the Sound, Mute and Vibrate options to get what you want. This went from a simple 2 button press to a much more involved process.
2. The option to preview text messages, "Preview message", on the lock screen no longer works. Yes, you can turn on the new notifications via "Notifications on lock screen" but I don't want to see all of my notifications on the lock screen and going through the settings for each app is a pita. Also, with the "Notifications on lock screen" turned on the "Owner Information" personal message is no longer visible on the lock screen. I have changed the settings, saved, changed the settings back to what I want, saved, wiped the cache partition and rebooted several times in between all to no avail.
3. The cell carrier name in the upper left hand corner of the lock screen instead of the notification icons is a pita also. I don't need to be reminded who my carrier is, I'd much rather know what notifications I have.
4. It took me some time to figure out how to get my widgets back that were removed with the update. The widget options are no longer available from the "Apps" menu. You have to long press a blank spot on one of your home screens to get the "Widgets" option.
Other than the above everything has been good so far. The update took some time but went smoothly. I do like the quick camera access from the lock screen, I have been waiting a while for this option.