I absolutely love this mod. A few things I've noticed, though:
1. When a mob goes out of range the bar turns a different color. Awesome. But it doesn't change back when (and if) the mob comes back in to range.
1a. Out of range screws up when I change targets mid-cast. Should continue to track the cast-target, rather than the actual target
2. When I choose a target -- say a mage -- and he starts casting blizzard, the cast bar shows up with all the appropriate information, but when I reselect my target (ie, target nothing) the cast bar is still up there. This also applied to focus targets.
I'm not sure if these things have been mentioned before, but 22 pages of posts is a bit daunting to read.