The preset stops are fairly accurate. along with the ability to size it to the slot on your table saw. The 45 degree stop created a fairly tight 45 degree joint. The down side was the back rest it is a little short and mine was not quite 90 degrees to the table top. I had to shim it with a business card to square it up. This is way better than the miter gauge that came with my saw its back rest way off 90 degrees to the table top.