This saw is great. The counter-balance system really smoothes out the saw. It doesn't vibrate back and forth as most other saws do. The quick change blade system is really easy to use. Just lift up the lever, and switch blades. I've only had it for a couple of months, but it effortlessly cut through concrete nails, steel, galvanized steel, cedar 4x4 posts... I don't know why I waited so long to buy one.