I loved the integration among all my devices as well. I think that's table stakes for note-taking apps. So often I jot something down at my computer and then walk out the door with only my phone.
However, their constant UI changes were maddening. The breaking point for me, which resulted in me now using several different competitors until I settle on one, was they decided that your cursor should start in the body for a new note instead of in the title field. I get that searching is supposed to replace every other single form of organization, but note titles are important in their interface, and actually really vital when searching! They got way out over their skis, discouraging you from adding titles when their own UI makes it a nightmare to have a lot of untitled notes. And it really was an effective nudge — after the change I struggled to consistently add titles even though titles are important for my workflow. I struggled between having a mess of untitled notes or applying constant discipline to fight the nudge, and I finally gave up.
That was just the straw that broke the camel's back. There were so many other fiddly UI changes that constantly forced me to learn new habits. I would gladly pay $30 per month (not kidding) just to have a version of Evernote frozen in time. I remember loving it for years starting around 2012 or so, then a few years of horrible quality problems that I wouldn't want to revisit, and then it was fine except for constant annoying changes.
I'll be paying my subscription until I settle on a replacement and figure out a workable export/import process to transition my notes to it (which I expect to be a struggle, based on the tools I've tried.)