When I tried this protractor, I was blown away by its versatility and accuracy. The V groove design keeps it secure on any metal surface and the neodymium magnet ensures it won't easily slip. The resistance to wear and tear makes it a reliable tool for measuring angles in various settings. The only con is the lack of instructions, which might be confusing for beginners. Overall, I highly recommend this protractor for anyone in need of precise and durable dimensional measurement.