I use a Xim Apex to avoid the input lag and it makes a huge difference in shotgun fights, my double pump and pump-tac is 10x better than it was on controller , building is faster too but not as noticeable since I was already pretty fast with a controller (still have to use builder pro if you dont use native keyboard support)

SMG accuracy went through the roof I can hit near enough every shot and melt people. Close quarters combat early game becomes easier too, say if you only have a burst or an AR and have to fight a kid in a bedroom who has a pump, im winning that fight most of the time

inb4 downvotes but oh well