First, these are perfectly cut to dig right into the screws. Rather than sliding around and stripping them, these fit so perfectly that there’s no room to slide and strip screws.
Second, they perform admirably when it comes to turning the tightest screw. My old set failed to remove screws from my notebook’s hard drive sleeve (apparently tightened by an employee burning off steam into tight screws). In fact, every effort I made to turn the screw ended up having my old set rip across my hand leaving my skin raw. On the other hand, this set allows for a comfy grip, and popped out those stubborn screws with virtually no force whatsoever.