Been heavily using this for years so I feel I should leave a review.
Never had any problems with this. There's no note categorizing or text formatting options (outside of changing the overall text size in preferences) so if you want to bold, italicize or strikeout some text, you can't – it's just plain text. Using ^⌘Space to incorporate emojis and other symbols like bullet points is enough to get me by now. If I need to do anything of that extensive nature I just use the default Notes app.
But if all you want is an incredibly simple, minimalistic and convenient note taking app, this is the one. I love the cute menubar icon, ease of accessing and syncing between devices - which I've surprisingly never run into any problems between the iCloud and Junecloud servers.
I would say my only complaint is that it's $5 for the Mac and iOS app separately - which I feel at the very least should be cheaper for iOS. However, with the aforementioned, it seems my money hasn't been wasted but still...$10 just to take some notes.