I recently purchased a heavy-duty grinder for my industrial needs .Based on my observations this Performance Tool M658 Heavy Grinder is a fantastic machine! It runs smoothly and quietly, and the grinding process is quick and efficient. The adjustable guard is a great feature to have, as it provides me with extra safety. The only con I can think of is that it's a bit heavy, but i think that's to be expected with a high-quality industrial and scientific tool. Overall, I'm extremely happy with my…