I like the concept of the magnetic holder, but not without flaws. It's very easy to set up and feels boxy. My complaint is that when I draw a line (i.e. slide across it while holding the pencil by the edge) I've found that it slips a bit due to pencil pressure, causing my line to become skewed. Another complaint along the same lines; When using it to check the squareness of a blade like a table saw, I like to adjust the square from the miter slot to the stop and run the square along the edge of the miter slot. If you use this type of square for this, the ruler will indent (slide inward) as the fence extends past the square toward the angled slot, making it difficult to tell if the fence is square or not, without really looking at him. measurement markings. Overall, this is a pretty decent tool for the price. I use it often and recommend it if the caveats are known.