Have you experienced any issues using PiHole? I would imagine some apps etc would go to lengths to prevent their use. But if it works I'll set one up for my partner who plays way too many spammy games.
But still find something a bit annoying and there is little we can do about it.
1. YouTube Ads are still showing up (you need to maintain a list quite often to avoid those ads) 2. To maintain the software (update is simple), but you better update and then back up the SD card and replicate it to the second Raspberry Pi.
In terms of performance, I have not seen anything blocker, no malfunctioning app or the network getting slower. Time-to-time, I got angry wife that cannot click on ad links. :-)
One, sometimes I want to browse/buy things via Google Shopping (or some other shopping interface) but the Pi-Hole blocks it.
Two, sometimes for work I will run a docker-compose script that say, downloads a copy of Puppeteer. For whatever reason the domain seems to be on Pi-Hole's blacklist.
Granted I could probably whitelist the domains but that seems like a hassle. It has the ability to disable blocking for periods (like 5 minutes or an hour) but that doesn't seem to solve the above problems.
Other than that, it works great. It probably won't affect a regular internet user. But occasionally you can run into problems.