So far, as many users report, I've found that the recent apps thing is missing (or not normally present?), but can easily be corrected with pretty much any launcher.
I've tried installing the Samsung TW Camera, but it failed. I tried dumping the Samsungcamera2.apk straight into System/App, and a reboot later it shows up in the list of apps, but it glitches and forcecloses with no apparent error.
I've had no issues with kernals, or root for that matter, and I just came from AOKP's latest ROM. I installed things like titanium backup, greenify, etc without issue.
LTE does infact work just fine for me on AT&T, though there is no direct way to manipulate via Mobile Networks like there was before, nor can you access the *#*#4636#*#* menu through the dialer, but alternatively
this app does the trick and allows access (despite the fact that it wants your money, you can do it for free).
I like this ROM overall, its noticeably smoother than previous AOSP-based ROMs, but you never notice what you are missing until you, well, are missing them. I look forward to the development of this ROM, and all its hybrid TW/AOSP features. Namely, like everyone else, that fancy-pants TW camera.