I was intrigued by this robot and did extensive study before buying it, reading both gushing praise and critical accounts of its many flaws, "factory marriage," etc. Despite the fact that the iRobot brand hadn't officially launched until the previous day and that not everyone is familiar with the equipment, I decided to take a chance on it anyhow. Here is a rundown of my thoughts and feelings after using this home assistant: Errors (such as "31") can occur on occasion, but after looking into what causes them, I've concluded that they aren't due to a "factory defect" but rather to the peculiarities that arise in the operation of the orientation system when using Wi-Fi and the internet. I've noticed that every once in a while, the robot will pause, the blue lights on the lid will start to "run," and then it will confidently move on. From what I can tell, the positioning system is talking about servers in the United States that send out data after being processed in the cloud. Therefore, it is possible for it to "glitch," even with a "excellent" Internet connection, if access to their servers is "not too." That is to say, in my experience, I have used the app on days where I cleaned the entire apartment without making any mistakes (many days in a row), but there have also been days where errors emerged multiple times (two or three in one cleaning). And yet, there is no evidence that "buggy" software would become more widespread; in fact, there is no sign of the system at all! I cannot speak to the vacuum's performance in the dark because I did not put it through its paces in that setting when I used it. Buying the S9+ was a good decision, and I don't feel bad about the money I spent. The wife, who was initially skeptical of the Roomba S9 +, now admits that it cleans very cleanly and that such a device is simply necessary if there is a pet; she is also participating in the use of robots.
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