SN is one of the best notetaking apps. It's good at most things, but excels at privacy. Very powerful writing experience, but no PDF handling, no web clipper and complicated and basic file uploading. Everything needs to be hosted in a separate service like Dropbox
I use this throughout the day to save thoughts and write notes on both my phone and laptop. It's become an essential part of my daily routine. It's been useful in both school and work. I haven't had a problem with it in the 2+ years I've been using it.
A worthy alternative to OneNote (slow start up, freezes and glitches, too bloated), Evernote (can fall down out of wifi area), Bear (Markdown lacks rendered view).