Earlier quoted context omitted.
Interestingly enough, for robotic vacuums _low_ weight is also a problem: the better your suction, the worse your ability to drive! The tank-tread wheels on Dyson's model are meant to help mitigate against this, but I gather from (now ex-) insiders that this is still a buggy sticking point (ha!) that needs to be solved before release.
I'm not sure the ability to drive is that much worse -- for constant curvature surfaces it should just increase traction. I guess the suction could be regulated if a certain varying inclide causes trouble.
them bumps