I dislike commingling any internet related services when it's not necessary but zero markup on the TLDs that they support is quite compelling. As an example, the renewal price for .com or .org domains is about $7 cheaper per domain/year than anyone else I've seen (specifically for renewals, not new registrations). Across a decent number of domains that adds up.

Anyone here with negative experiences, gotchas with the setup, or a reason to avoid switching?

Note that there's no intention of leveraging any of their firewall / protection services. This is purely to save money on the annual scamola of domain renewals.