Last time I was using their Windows app it felt non-native in a bad way (some 7-8 years ago).
Also, I managed to lose note content in their iPhone app just by opening note which contained large image. Image simply disappeared nowhere to be found either on phone or computer. After that happened for a second time I kinda switched to iOS Notes and later to Joplin.
I experienced a similar data loss, which was very impactful: I was at the "fast-forward" session of SIGGRAPH, making notes on what I wanted to attend. Somewhere near the end of the session, EverNote crashed and took all of the data in such a way that it was neither on my device, nor on the cloud. That was a deal-breaker.
I uninstalled the app and deleted my subscription.
These days, I keep my notes as .md files and they stay in sync using Nextcloud. I've been using this for ~4 years now, and it works great!
Also, I managed to lose note content in their iPhone app just by opening note which contained large image. Image simply disappeared nowhere to be found either on phone or computer. After that happened for a second time I kinda switched to iOS Notes and later to Joplin.