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And there's an annual subscription on top. I really don't understand the value proposition here.

I don't see an annual subscription. I see one year of "unlimited replacement of HEPA Bags, Mop Rolls, and Brush Rolls". That sounds great actually.

Thank you. Thats correct. Membership is OPTIONAL. Users are welcome to buy bags and rolls a la carte.

And Membership is more peace of mind with all-you-can-clean like unlimited bags and rolls, extended warranty, and accidental damage coverage.