It's the most friendly free DNS I have encounter.

- It's really free instead of "annoyingly free" that requires you to confirm every month that you are still using it.

- It lets you update with a simple HTTP request + token (e.g. "curl ..." command), no login protocol, nor any special login protocol that good luck if it's supported by your router or DVR.

- Simple copy-paste instructions for dozens of systems, instead of others DNSs that have no docs and their only instructions is to make you install their adware/spyware app

- No ads. Just a simple donate button at the end of the admin page which I haven't visited in months/years