I own a Mammotion Juka 2 800 robotic lawn mower, and so far my experience has been entirely positive. The ordering process, delivery, packaging, installation, and use of the mobile application were all straightforward and quick.
The mowing quality meets my expectations, and navigation—even in more demanding environments such as narrow passages—is reliable and smooth. The mower has become stuck only twice so far, without any obvious reason, but this was not a significant issue.
It currently operates across four zones, including several narrow transitions between them. Object detection works well; for example, it successfully detected a cable lying in the grass. With certain zigzag mowing directions, it occasionally missed small patches of grass, but changing the orientation of the zigzag pattern resolved this issue.
Software updates have been installed without any problems. The only improvement I would wish for is closer mowing along walls, fences, and in corners; however, this limitation is common to all robotic lawn mowers. If the mower proves to be robust and durable over time, I will be very satisfied with my purchase.