These sanders are so great because of the way they move. The sandpaper disc spins in a circle and the pad moves as well in a random motion. Therefore, the sanding marks are random, and the abrasive particles never follow the same path. The finish is swirl-free even when sanding across the grain. I rarely build something anymore without using my random orbit sander. It works quickly, much faster than hand sanding or other vibrating sanders, but it won't completely eliminate hand sanding. If you have one you know what I mean, if you don't check out the options on Amazon.