PiHole is interesting in the amount of ads it blocks, but also the ads it doesn't. Made most of the banners go away for the silly coloring applications my kids use, but the full screen video ads don't go away. The video ads really need to be blocked as there are a lot that are not appropriate for the age of my kids.

Some applications also refuse to start without tracking active. Took a while to figure out that "Envoy" the desk booking system wouldn't start while getting DNS from pihole.