It has been working flawless for me so far.
Only personal things that is annoying is that there is no mobile Internet button in the notification panel any more. How annoying is that, as I click it on/off a bunch during the day. Now I have to go into the settings and click it.... But really is not that big of a deal. It's how my wife's S3 is as well on 4.1.2.
Also now when in the Internet, when you click on on the menu button, there is no history button at all. Again, not a huge deal. Just it was handy to have for me personally. I'm sure I will find more little things but I will get used to it like this I know. I know that they can't please everyone 100%. The up's outweigh the minor downs so far anyways.
Anyone have any minor annoyances like that above?
But all around I like the cool little tweaks like when you click on the Window manager above. Just looks more slick now.
As far the battery life, I'm sure time will tell. It's always been pretty good for me. I always have the screen the brightest , no power save mode on ever, animated background on, apps running in the background and playing high-end games ect ect so no complaints from me before or so far now on 4.3. .. I mean what is the point of having a high-end phone with out using all the junk on it to the fullest.
Who cares about all the American carriers glitches .... TELUS For the win haha. Go upgrade now if you're on the fence of doing so.
That's my small review so far.
Anyone else have anything to add or say???