There are only a handful of Atlas machines in the world, they're complicated, and reliability isn't a main focus. Atlas, as a machine, is still, you know... it's still a little bit of a niche product. There is no doubt that the robot would be broken from time to time. The fact that the hardware was so robust, when viewed from the perspective of what we were trying to accomplish, was really great for us. It is because of that robustness that we were able to do the video at all, without which we would not have been able to do it. It seems to me that Atlas is a little more like a helicopter, in that there is a higher ratio between the time spent doing maintenance and the time spent performing operations on the aircraft. With Spot, the expectation is that it will behave like a car, where you can drive it for a long time without having to touch it, unlike a car, which will require you to touch it every so often.