I was a paid user for Evernote from 2010 until last year, with thousands of notes. It was the center of my GTD system - until they lobotomized the app.

In the name of efficiency, they unified the code base across all platforms and took away some of the most useful features. I used to be able to create notes via Siri on my iPhone, which was incredibly useful while driving. Then they put a new interface in place and required you to pay for a higher tier to be able to rearrange it, and you couldn't skip it to get to the notes list. I hung on probably too long, but the downsides just really outweighed the good.

I moved my GTD system to a combination of Google tasks (using Full Screen for Google Tasks) and Google Docs/Drive and haven't looked back. It's not quite as easy as EN was in its prime, but far better than what EN became.