Since I own the 96 inch version of this tool, it did not take long for me to aquire this one. Using this guide when cutting sheet material beats a chalk line hands down. I used both guides recently while installing particle board for carpeting. It made the cutting go fast and easy. What a time saver!  It lets you produce perfectly straight, professional grade cuts regardless of your experience. Just line it up carefully and clamp it down. Thanks, Amazon!