After analyzing the specs and real-world feedback, here's my honest take on which vacuum you should buy.
Get the Roborock S8 MaxV Ultra if you want the most capable robot vacuum available. It vacuums harder, mops better, and takes care of itself. You'll pay more and deal with a bigger dock, but you get everything.
If dock size matters, the Roomba j9+ wins easily. The Clean Base is a compact tower that tucks away nicely. The RockDock Ultra is substantial.
The Roomba j9+ dock is basically a small tower about the size of a kitchen trash can. It holds a bag for d
Good news: both the Roborock S8 MaxV Ultra and Roomba j9+ work with Alexa, Google Assistant, and Siri. You can tell either one to start cleaning, go back to the dock, or clean specific rooms. But there are some differences worth knowing.
iRobot
If you hate vacuum maintenance, the Roborock S8 MaxV Ultra wins this one handily. Its dock does almost everything for you.
The RockDock Ultra handles:
The Roborock S8 MaxV Ultra costs about $1,800 at full retail. The Roomba j9+ costs around $900. Seems like an easy decision, right? Not so fast.
The Roomba j9+ doesn't mop. At all. It's vacuum-only.
Neither of these vacuums is quiet. But they're not terrible either.
The Roomba j9+ runs at about 65 decibels during normal cleaning, roughly the volume of a normal conversation. You can hear it, but you can talk over it and watch TV without cranking up the volume too much.
The [Roborock S8 MaxV Ultra](https://www.amazon.com/dp/B0CSKBXQ68?t
The Roborock S8 MaxV Ultra lasts longer on a single charge: up to 180 minutes versus the Roomba j9+'s 120 minutes. Those are manufacturer numbers though, and your mileage will vary.
The S8 MaxV Ultra has a
Both the Roborock S8 MaxV Ultra and Roomba j9+ claim to avoid obstacles, and both are pretty good at it. Neither is perfect. If you're expecting a robot that never hits anything, you'll be disappointed by both.
The [S8 MaxV Ultra](https://www.amazon.com/dp/B0
Dirt Detective is iRobot's way of making the Roomba j9+ smarter about cleaning. Instead of treating every room the same, it learns which areas get dirtiest and adjusts accordingly.
Your kitchen probably gets dirtier than your guest bedroom. The entryway sees more foot traffic than the home office. Dirt Detective tracks th
The RockDock Ultra is essentially a maintenance robot for your robot vacuum. It handles almost everything you'd normally do manually, and it does far more than any Roomba dock.
Dustbin emptying: After cleaning, the robot drives back and empties into a large internal bag. You deal with that bag maybe once a month instead of emptying a tiny dustbin daily.
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In most cases, yes. Our answers are put together from each product's published specifications and the reviews ShopSavvy collected, and every price on an answer shows when it was last seen. That said, product details can change — we recommend checking the latest prices and availability before making a purchase.
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