Good and bad for BC
I love the new black cleaver and it certainly has a place. It will certainly add more than the usual ADC's job of farm till BF, and if you are behind it will help a lot with being able to do things in stages and build this. 2200+ elo games that I watch religiously are ending earlier and earlier because of early game advantage so more expandable lower tier items will help fight this
But the bad is that this is more than a remake, this is removing an item from the game. I took the old black cleaver for the attack speed and armor reduction over 3 shots, not 5. This makes it less efficient for ADC's to the point of being not viable. You can't ignore attack speed for that long as and adc, but even if you did decide to go with it the stacks would take too long to build.. as you dont have AS. It needed to stay at 3 to be useful but now that it triggers from ad mages abilites that would make it op for them..
Now you need a new item with attack speed and damage for adc's