We just moved into a brand new home - construction dust has been an issue with me. Normally, I wash my floors by hand - yes, on my hands and knees to get to every corner. The main living area is tiled and rather large and not very efficient for me to scrub by hand. Purchased this the other night and let it go to town. I am thrilled that it got all the construction dust off and removed the "gritty"feeling on the tiles. We run it every night after dinner to keep the floors clean and am now purchasing another cube to get better coverage. I can't imagine life without Charlie now. I am now thinking about buying the Roomba 880 to go along with it.