im using m2
the features are good
cons:
1. abnormal battery usage(i used to get 4.5 min per 1% battery down in 5.12 ,now its worse i hardly get 2 to 3 min per 1% conuption)
2.small bugs ,camera
pros:
1.  google services just work awesome when compared to 5.12
2.new features are good
conclusion:
waiting for global flyme6 is better for good battery life i think