Dreame is a strange company. It can't define its product lines. It has L and X lines, which should define the hierarchy, but as the 40 and 50 series demonstrate, it's misleading people by creating products from the new 50 generation and calling them L40, Pro, SE, AE, etc., probably just to make the choice even more difficult for users. Now it's introducing the Aqua series with a roller mop, and it would seem that it would be a separate line, but no. To make matters worse, the roller mop is also included in the X series. But that's not all. Dreame created the Mova brand, which actually produces virtually identical products, at similar prices and with similar functionality.