are note edge edge panel still functional in the 6.0.1 official update?

I've been wanting to update to android 6, but i heard that there are bugs, can someone please tell me the bugs that they have encountered

i have read somewhere that some edge functionalities have been removed, such as phone calls (they are not showing in the edge anymore, night clock, etc.) are there any other edge functionalities that are gone? when updating from Kit Kat to Marshmallow?, or should i update, i want the new Icons, screen off memo, air command ui - that is all i want from the new update (coming from stock kit kat)

thanks

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