I've tried installing the 5.1 a few times (with stock firmware between) but I get one bug.
Terminal Emulator always crash as soon as I start it.. "The application Terminal Emulator (process jackpal.androidterm) has stopped unexpectedly. Please try again. [Force Close]
Only suggestion for improvement I can recall at the moment is the center-aligning of the alarm-clock text on lock screen. (When center alignment option is enabled).
Other than that the rom works perfectly and it's by far my favourite, keep up the good work.