This was a question mark when I bought it over at Woodcraft. I had a large sheet goods job coming up and I thought it would be a help in keeping the ply against the fence. The instructions are good but in many places they juxtapose front and back in the instructions and the diagrams contradict each other. Thankfully it is dead simple to install and it makes no difference in which direction the guide holes face, front or back. Here’s a few pics of the install. The initial test was very positive and it delivered as promised. I’ve now used it for several months and it has become part of my routine for ripping long stock, and cutting plywood. The one way needle bearings have zero slop. On a couple of occasions the ply did come off the fence, binding the blade enough to trip the breaker, but the needle bearings held the ply in place. I’ve never tripped the breaker before on my 3hp SawStop. Its very easy to setup and use. Just lay the piece you’re about to cut next to the guide. Loosen the big knurled knob and set the flat bottom on the board. Tighten the knob and your done. It accommodates any width board or ply. Glad I discovered this, and will consider Jess-Ems other work holding tools. Positives: Very well engineered and made from quality aluminum and steel, and very well finished. Very easy to install, adjust, and use. One way needle bearings have zero play. Angled nylon rollers pull material to fence quickly without slippage. Increases safety of cutting plywood sheets exponentially, especially when doing so by yourself. An added bonus is that you can remove it and use it on a router table, but I don’t ever see me doing that. Negatives: This is a very well thought out tool, so there are not many. It’s not good for narrow cuts less than a few inches. I’ve now lost the top of fence storage that I had before. You have to drill holes in your fence to install it. When wheels are in the retracted position on top of the fence, they are too close to the knurled knob making it more difficult to easily grab and loosen. Instructions can be confusing. The negatives are REALLY nitpicking. I’d buy this again in a heartbeat.
UPDATE: The O-rings will last several years. At some point, depending on usage and age, they will become soft and will no longer work. I bought a new set of 4 from Infinity Tools for $9.90 plus shipping.