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The auto-empty is absolutely worth it. If you want to be very thrifty, get an i7+ from eBay, or a refurbished J5/J7.

It’s also indispensable if you have pets. Cat and dog hair fills the robot up fast.

My old Pethair Plus would find fists of hair in a day or two.

Made me realize the importance of defining your use case as narrowly as possible, when buying home appliances.