I recently added a Sawstop Overarm Dust Collection system to my Sawstop PCS175. Since I'm not currently in the middle of a project, I've only run a few test cuts on some plywood. These were all through-cuts. Overhead dust collection was very good. Some sawdust was able to escape to the side of the blade guard, but not much. My only complaint is that this item doesn't include the blade guard and I didn't read enough of the web page to discover this prior to receiving the ODC. So don't forget to include the blade guard in your order.