Other than like caps lock doing nothing, I'm completely in love with this ROM. I have not encountered any issues, and even used Titanium Backup to restore select user apps with their data, though many needed to be downloaded again from the Play Store as they are ICS-specific versions like for Gapps. If anyone is having problems, you may have missed a step somewhere. I used the GB-only tool to sbf my phone back to stock GB, then used stock recovery to install the OTA update to ICS, used the ICS-only tool to root and install Safestrap 2 onto that rom, switched to Safe Mode in Safestrap and then installed this rom with patches.
It is faster and the battery lasts longer than stock or GB. Only thing missing is a real notification power widget baked into the ROM instead of having to use an app to stick it into ongoing, but at least that works under ICS. Thank you again for porting this rom to Droid4, it is as though I have an entirely new, better phone now :-D