"Good for the first dozen or so holes (mostly through joists), then seemed quite quickly to become blunt. Now almost useless. At any event, some decent (Bosch) spade bits seem to make quicker progress with less effort."
"Bought to cut holes in joists, but needed to use impact driver as my 18V Makita angled driver could not drive it through. Although fluted I found it clogged easily, especially if anything thicker than 30-40mm. It's sharp enough alright, but aggressive cutting and self-driving means you need power to stop jams. Clean hole made, but not convinced better than using quality flat bits, especially at this price?"