I bought one of these (for $100 from BigLots) because the lower floor of my big house in the woods has mainly hardwood floors, a kitchen, laundry, and solarium floor of linoleum, a lounge with really plush carpet, and I have little desire to deal with any of it. My seven cats, "The Swirl", aren't much help in the floor-maintenance department either.
My first negative feeling came when I read the instructions to "sweep the floor" first. WHAT??? If I wanted to sweep, why would I buy a machine to do precisely that in the first place? But the instructions went on to warn me that damage can be done by something sharp being trapped by the pad, so I calmed down and proceeded.
Okay...cute little thing scoots around bumping into stuff, getting redirected by furniture legs, food and water bowls, and whatever has taken up residence in the space. The dry sweep pad dutifully collected an impressive amount of debris, but I was delighted to set the machine humming with its wet pad working. Hmmm...not too shabby for a while, but then the pad starts to dry out, and has collected too much dirt, cat hair, stray cat food bits, cat litter, yard detritus, and whatever to be effective. I washed the pad and set the robot critter up again, starting from a different angle.
Between having to sweep first, and running out of wet before the floor was clean, I quit and just let the robot sit in the corner unused and sorry I'd bought it. But my precious neighbor asked if she could use it for a bathroom floor that she and her daughter share--and which faces daily hairspray that collects to impossible depth. She LOVES it!!
Bottom line: Not for huge area of messy floors. Nor throw rugs. Nor cleaning up behind one little congested snot-producing kitty or the occasional regurgitation of a meal or hairball.
But wait!! Enter the Roomba iRobot sweeper first!! (Offered 5/29 on Woot!) Now we're talking! Turn the Roomba sweeper on first to actually sweep up the debris, then follow with the Mint wet pad and the floors stand a chance. Not the fully dried snot (which NASA could use to glue tiles on spacecraft), but most everything else. Especially if I remember to put little 'spills' of soapy water here and there across the expanse of flooring so the pad can refresh itself.
So, small floors...great! Larger floors working behind a Roomba sweeper...great! But keep in mind that the Mint, unlike the Roomba, does not do rugs.