lich bane ahri?

hello all. i'm an main and i was hoping some one could clear something up for me.

Is good for ?

I keep seeing guides that say it is good for her and the numbers of it add up in my head, multiple procs from her ultimate and such. along with this i keep finding myself throwing an auto attack into my combos so on paper it seems like a good choice for me but i'd like a second opinion from some one who has used it in PVP.