Bests & Worsts Reviews from Amazon

*** Update: Jan 1st 2019 *** I upgraded the rating from 2 star to 4 star. I was able to make it run over dark rugs by disabling the "cliff sensors". Following the suggestion from the customer service (you can see it in the comment to my review below), I used white photo paper cut slightly larger than the sensor holes, stuck the edges in first so it had a slight bow and taped it in place with Scotch tape. So far has been working well. --- Original Review --- Edited Jan 1st 2019 I got this Roorock E25 for Christmas and I have been using it and playing with it for several days now. Amazing machine: - cleans very well or at least much better than I expected. - uses a planned, line by line, pattern rather than a random trajectory through the house like the competitors do - seems to have a pretty intelligent algorithm which is more evident when encounters obstacles - with one charge cleans just about the hole surface of the house - navigates multiple rooms which are quite complex in layout and shapes, and goes around furniture, quite well and finds its way back to the base. - it generates the map in the application as it goes. It remembers the map between incomplete cleaning cycles. If it runs low on battery, it will return to the base and recharge, then it will continue where it left off and continues from there. However, if it finishes the cleaning cycle, or if you command it back to the base, it does not remember the map and starts over again next time. - I have some trouble areas in the house where the vacuum gets temporarily stuck and it struggles to get out. Although it frees itself each time, during the struggle to get out, the wheels turn in place, so the vacuum thinks it moved more than it actually did so it gets "out of sink" with the map. It will eventually re-draw it, but it does mess up the navigation for a while. Even so, it did find its way back to the charging station on its own. - I didn't have to give access on my phone to anything that I didn't feel comfortable with. I just needed the email address and allow it to get to the Wi-Fi (although the process was a bit confusing as there were no clear instructions on how to install or even what app you should use). The not so good part: - it has four sets of optical infrared transmitter-receivers sensors around the perimeter in front that are supposed to protect it from falling off the "cliffs" (stairs). Unfortunately these sensors will detect dark lines in rugs and interpret them as cliffs therefore the machine refuses to run over them. Since I have quite a few rugs with large dark colored areas, the machine only cleaned around them. There is no way to defeat this "feature" in software. However, I was able to trick the sensors as shown in the update above so I changed the rating from 2 to 4 stars. If they give us the option to disable those sensors in software, it would easily deserve 5 stars.