All you can gain is a bigger screen and in some scenario's (not all!) a better camera. Furtheron you are more likely to downgrade rather than upgrade.
You have your bootloader unlocked so you are able to flash MM as stock (brazillian by iWoody) o...
How can can I erase my battery stats through TWRP?
1) boot into TWRP recovery
2) mount your data folder
3) browse with filemanager
This is goddamn impressive, Sunshine will have my 25 bucks for this
I have put the 7 plus' camera to a tough test at some very low/none light area's. HDR+ was on, but no night-mode.
I am impressed with gCam. Several photos with high, low and (basically) no light.
Apex launcher, self-made background photo with Gcam