1) What kinds of information and insights did it give you about the usability of the prototype?
There are different information and insights I got doing the usability of the prototype being an observer and participant, in which they actually differ from how we interact with the objects.
2) What aspects of the technique worked well or were frustrating?
The observing method worked well with me as I got many points and thoughts of how to develop the prototype better. The frustrating part was the think aloud one because it related to participating like different users which depend on the personality of whom you are interacting with.