I'm moving the backend of this site to the sanity.io headless CMS. The old backend used markdown files in a git repository, and I wanted something I could easily use on my phone. (This site's frontend is still using next.js, which has been great.)
More importantly, I wanted to explore using sanity as the backend for some other sites I've been building and hosting for other people. I've been looking at a few candidates for replacing Perch, and so far sanity seems to be a great alternative. I also (mostly) love the idea of using a SaaS so I don't have to host it myself.
So far I've been really impressed with sanity. It's definitely a developer-focused CMS, so it requires coding to get up & running, but it's been incredibly easy to get started with. And querying for data from my nextjs frontend has been refreshingly straightforward.