I purchased the smaller box joint jig from Rockler recently. I have been making some test cuts to get this down before I try it on a project. I have been having a lot of problems with chip out. At least that is what I am calling it What is happening is that each time I move the wood to the next key, I am losing the tooth that preceded it. So when I am done, all the teeth have been knocked out. In looking at the comments on the Rockler website, I think I saw at least one comment that said you need to use a spiral bit, which I am not. I was also wondering if it was a simple matter of my going too fast with the cut ? I am using 1x4 pine if that makes any difference rather than a hardwood. I have also found that the Rocker jig, being very light weight is not real easy to keep in the track, so I am finding it difficult to get the same height on each rout also. But that is more me than anything else.