Like most, I purchased this tablet specifically for note-taking and under the pretense of potentially using it for reading comics/manga. Prior, I used the Remarkable, but I did not enjoy the locked-down OS, they market it as "fewer distractions", but realistically it's just fewer features. For example, my school requires an App to sign into their WiFi, which the Remarkable, having no access to the Play Store, was unable to retrieve. This led me to the Boox, running a custom version of Android. For the first couple of weeks, I found it to be far superior. The pen, writing experience, and the operating system.
Ultimately, where it fell short was the follow-up after taking the notes. It had a LOT of trouble syncing up with Google Drive, where I keep my notes. It took forever to sync even when I initiated a manual sync, and sometimes it simply would not. It required me to download the Google Drive app and upload it through that manually, the built-in Boox OS Google Drive sync simply could not cut it. This is in comparison to the Remarkable, which did a fantastic job syncing to Google Drive or their Remarkable desktop app.
It's pretty hard to justify the tablet when a huge function of their note-taking has issues. It may work better for OneDrive or another syncing service, but for me, it was a huge deal breaker when I'm spending ~$550 for an E-Ink tablet, specifically for note-taking. Other negative factors involved the battery life and the lack of a case. The only Ultra C case I found was a ~$100 case on Amazon, the uniqueness of the tablet leads to very little third-party support. Unless a COLORED E-Ink display is absolutely required for you use, I would avoid it entirely and either go for a Remarkable or pivot toward a Galaxy Tab/iPad, the latter having more features than just note-taking after pairing it with a matte screen protector at the trade-off of not having the E-Ink display.