Pi-Hole is great! Around 30% of the traffic is blocked on all my devices.
However, I would recommend adding a few more decent block lists to the default ones. Also updating these lists through a cron job on a more frequent basis is a good idea.
Here's a script that you can use to setup pi-hole and additional block-lists: https://gist.github.com/user501254/1d4c8cb9f22fb51ae970f5fe0...
Also make sure you are using 1.1.1.1 as your secondary DNS service. So this way in case your Pi-hole running RaspberryPi is down, your devices would be still be able to access the internet with some privacy.