I am a paid subscriber but I am not happy with this at all. The mobile phone app is a pretty buggy, when I start typing in 1 place the cursor jumps to another. Copy/paste has also given me problems.
I do like that it encrypts locally on disk like it does in the cloud. Several other apps I've looked at has said at rest encryption isn't worth it, I guess arguing that users could use veracrypt or some other solution.
If I had to write a one sentence summary of Standard Notes it would be "An E2E encryption app first, a note taking app third".