Thanks to the OP
This is one of the very few ROMS that actually works with the SGH-T999L. Runs smooth, did a a full wipe restored my apps and data from backup.
LTE data, hotspot, Wifi Calling all working well.
For anyone having trouble with root, this is what I did and everything works perfectly
1. Flash Rom as normal.
2. Flash SuperSU. I used the flash-able zip update v 1.80 The one on the play store did not work for me. http://download.chainfire.e...
You can also update ClockworkMod to the latest version 22.214.171.124. It adds external SD support for T-Mobile Galaxy S3's
If you use RomManager from the play store, updating to this version is a simple tap of the screen.
More info can be found on ...
I too have no issues using the built in WiFi tethering on ICS.
Currently running DARKSIDE.EVOLUTION.3 v7, smooth as butter, no issues at all.
What ROM are you running?