My yearly subscription for iA Writer doesn't expire until next month so I reinstalled it last night just to see how it felt.
The only notes app I've been using since January is Google Keep and that's only because it syncs to my watch - very handy for shopping lists.
If I want to make notes for a post or muse-letter I'll save them to the Garden or as a draft straight in the browser. For writing, I just don't really have a need for a notes app any more. On the odd occasion that I want/need to type something but don't have mobile signal then it goes into Keep until I'm back online and can transfer it.
It just felt awkward testing iA Writer again, it feels strange using any notes app so I removed it and cancelled my sub.