Strictly to the topic of the thread, the bullshit is the motivation for the topic itself.

To the discussion about Dyson, I echo other comments here regarding durability: having used one for about 14 years I found out its maintenance was not bad at all, with the occasional hair cleanup of the brush and the chamber filters. It was sold just because the missus wanted one with a HEPA filter.
We also are on our second battery powered unit (the first one broke on a stupid accident after 10 years) and both work really well.
Regarding the robotic stuff, I got very tired of having to unclog/clean the brushes and the dust compartment four or five times at every cleanup. It might work for a house with a single person but, when you have three long-haired girls, it is quite impractical.