All the S Stuff seems, for me at least, to work just as well. If someone knows different, feel free to correct me.
---------- Post added at 02:26 PM ---------- Previous post was at 02:17 PM ----------
For the firmware:
http://www.sammobile.com/firmwares/
I used Odin.
After reboot, I installed Towelroot:
https://towelroot.com/ and launched it.
I then installed SuperSu from the play store and launched it and let it do it's thing.
Finally, and this is totally optional, I installed Nova Launcher so My Magazine doesn't pop up when pressing home button. ( I couldn't find a way to disable My Magazine completely so I use Nova Launcher, It also has quite a few other nice features)
As I said earlier: I love my Tablet again. Everything seems for me to be so much more intuitive and operational.