If you are used to cleaning your house with a handheld vacuum cleaner or even a good old-fashioned broomstick, the idea of switching to a robotic vacuum cleaner for the first time can be unnerving.

The F10 BMW M5 marked a huge step up in performance, usability and refinement over its predecessor. The wailing motorsport-derived V10 of the E60 was something that could never be equalled, but with ...