With GitHub's recent instability, I'm seriously looking into alternatives. But the one piece of the puzzle I haven't figured out yet is GitHub Actions. I've used both TeamCity and Jenkins in the past, and have no desire to go back to either one; GHA, for all its flaws, was just so much better of an experience than TeamCity or Jenkins, for me at least. I've read about multiple alternatives to GHA for CI, but it's hard for me to tell just from the documentation what they feel like to use.

So, for those of you who have used left GitHub Actions and are using a different CI solution, I'd like to ask: what did you settle on? Why? Are you happy with it? And how does it feel to use it? Do you feel like it's invisible and gets out of the way, or do you feel like you're constantly having to massage its configuration all the time?