Worth every penny.
Stability: Rock solid on all iOS platforms, and consistently syncs/works flawlessly on iOS 8 and 9, in addition to the desktop version for OS X 10.10 and 10.11.X.
Ease of use: Doesnt get easier or more convenient than this. Literally requires no tech savvy or intuition to navigate around the wonderful features of this app.
Is it really worth $9.99?: Thats up to you. Do you have more than one iOS device? If so, the price alone is worth it for iCloud syncing of notes between an iPhone and iPad, not to mention the desktop version. So, if you have an iOS device and the app for the desktop - then yes, worth every penny. Markdown notes have rarely been this easy and convenient. My only recommendation for an alternative for more hardcore text-editor users is the always-perfect, "Textastic," by Panic. Cant go wrong with Panics software, but you really cant go wrong here, either.
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