We got the first Double in late 2015, it was a solid unit. We another 1st-generation and a 2nd generation.
However since late summer 2017, through now (early 2018), the Double Robotics app on the required iPad crashes. It requires someone to intervene at the robot itself.
This happens sometimes several times in ten minutes. This makes the robot essentially useless. The ratings are based on this.
The so-called support team at Double has gotten crash logs from us, videos, and has only interacted with us that they are working on a solution.
It's no longer viable.