I attached a video of us using it. Clearly we do not last a long time and I do not push it. I sometimes use the recommended questions and sometimes we go on our own tangents and just talk about something else in the picture. I think its easy to start a conversation on any of the cards and it helps you discuss things that do not normally come up (like seasons!)
When compared to reading books- I do think she enjoys books slightly more than these brain quest cards because there is a story line. I would say books are more powerful than these cards at improving vocab/speech and more educational overall. But this is a great side tool.