Teeth broke on a 1/2" bit while I was only doing my third cork (oak). The first two came out very nice and clean, much better than the others I've used before. Too bad it didn't last long. UPDATE: I contacted Snappy Tools about my experience and got a very quick response within an hour. There seems to be some known quality control issues with some new ones Having given batches that caused some bits to become very brittle. They sent me a replacement 1/2" bit and tonight I cut 12 studs with the new part - no problem and works great. Their customer service is top notch and got me a replacement within 3 days. Upgrading my rating to 5 stars as the new bit works great and seems reliable.