My pleasure to be the first one in OP !
With wishful regards to my brother, UpInTheAir for his hard work I'm writing to inform people around about the biggest problems I've experienced with this kernel since MM.
I was afraid of flashing stock ROM, hence I waited about a week to have a debloated/tested custom ROM.
Once one came out, I had to have both bootloader and modem flashed to make custom MM ROM working, I did and everything seemed to be happy at the moment but problems started to ruin my head (some of them still exist although)
I had problems with sudden screen off with the only solution of hard rebooting, Synapse couldn't be working and this kernel is much more power with synapse.
Any how, after 2 weeks of pain I tested something stupid which worked for me.
I flashed a stock ROM with odin, then flashed TWRP 3 and then a custom rom and at the end kernel flashing procedures. the only problem which still exists is charging while phone is off or even rebooting from recovery/bootloader while phone is pluggen in with USB cable.
Everything else is working so fine.
I really recommend to flash a STOCK ROM instead of BL/MODEM only.
by the way, since presence of supersu 2.68 so many issues have gone as well which wasn't available at the time of initial releases of SkyHigh nor Marshmallow for Samsung.