Ineffective. Have to go over the same areas 3-4 times to get it to look right. The handle, though secured as instructed, is not stable at all and turns about. Needs a power switch rather than a trigger to power it-- I have arthritis and carpal tunnel and was in severe pain for 3 days following use. It's better than nothing I guess.., but should just spend a little more and get something with better quality. Its handling is comparable to pushing a toy truck with a broom handle. Kind of a pain in the a**.  Will be returning this after just one use.