SHARK Matrix Plus with Self-Empty HEPA Base

I bought this same model at Costco on sale for downstairs. It does a good job and I'm happy with it. I got this refreshed unit for the upstairs. It was a little more than $100 cheaper. It came with everything the Costco unit came with except the original box. There was one dog hair in a filter that got missed, and the round foam filter was no longer white. A couple of specs of dust. Otherwise, it was very clean. It works just like the unit from Costco. The Shark app controls and schedules both my units. I don't have a dog or kids, so it works well for me. I empty the dust been every few days even if I don't really need to do so. (Got to have some excitement in life.) Replacement filters and brushes are available on Amazon for about $20 even if they don't specify the model. I gave up on trying to find a equivalent model and just went by looks on the filters and brush rollers. Note that this unit would not be cost effective if the replacements parts had to be purchased directly from Shark. I have not had either unit more then 6 months and have not needed to replace anything yet. The battery holds it's charge just as well as the new unit from Costco. Both units run about an hour for the first pass when cleaning. Both units need to recharge a couple of hours before finishing their floor - it's a large house. BTW A battery replacement is available from Amazon for about $20 should it be required someday. I use my old vacuum cleaner to clean the Shark robot once in a while. The filters collect a layer of dirt. The white round filter can be washed, but I find vacuuming it works just as well. The robot will get hung up on cords if they are out where they will be run over, so don't be sloppy with the cords. The robot tends to "hop" around the base of standing lamps. This can be noisy. I should use the app to exclude the lamps, but I'm lazy. One last note. Some units have a filter and screen that's molded into the dust bin used on the robot. Replacing it means replacing the entire dust bin. This is not the case for this unit. Both the filter and screen can be replaced separately. The "orange" filter slides out. The screen screws on. I originally named by first unit "Dirtbag". A close friend suggested I was insensitive to my robot. Okay, "Dusty" it is. I was tempted to name it after that person as a joke, but I decided to live instead. :) [Update] I bought a 2nd one for a friend in need. Can't beat the price. The unit came very clean. It was cleaner than the 1st one I bought. It also smelled clean. When pairing WiFi the first time it spoke Spanish, but I managed. Once connected to WiFi I used the app to change the language to English. I now manage 3 sharks from my app. Somebody else's map was linked to this unit so I did a factory reset from the app. This required starting over, but the WiFi pairing was in English this time. The unit works well. My friend's floors now look clean again.