What do you like best?
Nothing really. There is something to be said if you REALLY want to get a lot of impressions for an ad, but I've found that placing your ads on Audience Network isn't meaningful.
What do you dislike?
You get a ton of impressions, but with my experience in an agency and working with other agencies it's just a clumsy way to get more impressions. I haven't really seen any meaningful actions through audience network and a lot of traffic bounces from websites. People will tap the ads accidentally and immediately go back to what they were doing before.
Recommendations to others considering the product
Do some experimentation with it before you commit to running any major campaigns. I can see how it might be useful if you have a MUCH larger organization, but typically it's not great. If your goal is solely brand awareness, it might be helpful, but for the most part, it's just a pain for the user. Anywhere I've worked, there's been a stigma against it.
What business problems are you solving with the product? What benefits have you realized?
I haven't found any benefit to using it.