Redmi-2 811 2G LTE - Ram use increased of about 200-300MB (probably because there is now Android 5.1, I remember there was 4.4.4 before?), seems the battery drain is faster.
Brightness is too low in sun, even at max, both auto & manual (before my setting 60% Auto was enough).
Working well, fast and fluid.
I have noticed same issues (faster battery drain and lower brightness) on Redmi 2 1GB -> 2014811 / wt88047