When David’s Neato robotic vacuum cleaner stopped working after more than a year, he flipped it over and tried to figure out what was wrong. It was out of warranty, but maybe it was something simple that he could fix himself. Yes, a tension spring was missing, and the vac wouldn’t be able to maneuver properly. So he called up Neato Robotics and asked if parts were available, since this was something he might be able to fix himself. Nah, forget that: Neato Robotics just sent him an entire new vacuum, no questions asked.