Yes, I really wanted to use this product today. I used a medium bit to see how it would go and within 2 minutes of my work the bit broke on the shaft. I switched to a smaller nozzle and after about 2 minutes the Allen screw came out. Picked up one of the broken bats. So basically in 4 minutes 2 out of 3 bits have failed. I hope the seller produces replacement parts or better yet a full refund