What kinds of information and insights did it give you about the usability of the prototype?

When I play a test user,I am faced with a strange site that finds the location upon request.I have to keep saying.  pay attention into the test. This is a challenge for me. I often forget what I’m going to do.

When I play a evaluator. I will pay more attention to the tester’s facial expressions.Through the facial expressions to observe his satisfaction with the web page.I can watch the expression slowly through the video.

2.What aspects of the technique worked well or were frustrating?

As evaluator,It is easiest to observe the tester through facial expressions. But Some expressions can not be accurately judged.