People love Amazon Echo , but more and more people are buying the smaller $50 Echo Dot, which can do all the same things as the Echo but also be plugged into other speaker systems to take advantage of the better audio quality. In fact, the Echo Dot has been the top-selling device on Amazon.com since November 1. As more and more people buy into the Echo family, they’re also learning the nuances of owning these types of devices – specifically, that they can’t always understand you, and don’t always do what you want them to do.