I wanted a set with two main brushes but for the price this seemed like the best option. Very happy with my purchase. about 10 minutes to change everything. I used to empty and wash the blue storage compartment, but this is the first time I've changed anything on it and I've had a DEEBOT DN622 since Christmas 2018. So no advance notice. very easy. I replaced the main brush with a small regular Phillips (positive) screwdriver. That was all I needed for the whole project. There is a blue cover on the main brush and the rubber associated with it still looks like new so I didn't purchase a kit to replace it. After removing the lid and pulling the roller out of the cavity, there was hair and dirt that I wiped off. It took a bit of work because it looks like he's hit something wet and sticky? (It was taped to the wall. God only knows.) There were no particular buts. It came off easily when I put it on with a damp cloth. I looked twice because the brush that came was a much duller yellow and the bristles looked so small in comparison, but holding them close together and comparing the moving parts? You are a good substitute. I was concerned about installing the new brush incorrectly, but the ends are different sized squares, making it quite a challenge to install them incorrectly. Exchanged everything with no problems. Round brushes are easy to remove with bare hands. Easy to take off and put on again. I also replaced the air filter which is on top of the clear cartridge. I took out a white paper filter and a thin black foam filter/guard for it. Pretty easy stuff to replace. The other large blue/white washable plastic filter, also in a Debree cartridge, is still in excellent condition so I didn't bother to replace it. Before I turned the car over, I noticed that there was a lot of hair on the front wheel. Upon closer inspection I found that this front wheel actually popped out and I used a screwdriver to wedge the wheel. The only reason I felt a screwdriver was necessary was because it was wrapped in hair. Wondering if you'll ever need to change a wheel? I rode it for a while after buying it. It works better than ever. I love it. Great price for great products.
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