QC pass. Bought some Ali Pozidriv impact bits to replace the ones that shattered in cold weather driving a big screw into a frozen stump at max torque.
The stump is frozen again, so I drove the same screw, which this time broke the screw, not the bit. Another went in fine (at the top highest torque setting of the impact driver).
So according to my not peer reviewed research, these are better than Bosch and Forte Tools