After a full day of use, I'm still not sure how I feel about the S7e. Battery has improved compared to my Note 5. However, I'm getting a high usage of Android System (at 32% right now), not sure why. My SOT as of now is at 3h 15m 46s with 41% battery. Also, like others have mentioned in the beginning, it's nice to see Cell Standby at the bottom of that list.
Anyway, I still haven't decided whether I'm going to keep it. I think running Marshmallow really helps! And, I can say with certainty that if my Note 5 had Marshmallow, I'd probably would have skipped the s7e.
one last note: I don't like the scaling but I'm going to try adb a little later to down scale.