I installed Pi-hole over the weekend. It's the shit.
Only problem I had was not being able to go to Google Analytics.
If you run this command in ssh, you'll be able to add Google Analytics to your whitelist.
pihole -w analytics.google.com
The good thing is that you can go through the Pi-hole admin and disable this after you are finished.
Note: My wife has been having a hard time getting free gems because all the ads are blocked for her mobile games. =D