I installed the CM11-M9 in my NOOK HD+ last week. So far I have a good experience especially changing the runtime to ART. The only con is the battery becomes unstable compared to stock ROM. The problem I have encountered is battery drains extremely fast, from 100% to 60% within 1 hour and then drops to 1% about 30 mins. The weird thing is the battery still holds near 3.5 hours at 1% battery level. I tried to reinstall CM11 for but have the same issue. Anyone knows how to fix this problem? Thanks a lot!