My daughter bought this for us for Christmas and my wife was ecstatic because we love Walle out 900 series irobot. We have tried all three solution setting and found the middle one to work about the best. Even though the solution is a concentrate it is pricy. We invested in the washable covers and seem happy with that decision. The mop head may have done better to the rear due to occasionally leaving wheel marks through wet areas. It is to early to tell after a month of only a few tries, but I do feel the Eva cleans well overall on our hardwood floors.