I've been a Premium user for three years now. During that time, I tried other solutions, but I kept coming back to Evernote because it is uniquely useful.
Competitor tools treat Evernote as a note-taking tool and try to beat it at that. The problem with such comparison is that Evernote has long time evolved away from being just a note-taking tool. It has become a knowledge sharing ecosystem, a type of universal file system where you can mix multiple media types and store them in a single entry. A new entry can record audio, scan in pictures, and record formatted text all at the same time in one place. You can organize all related information for various scenarios (meetings, classes, etc.) in one entry, and it becomes available on all of my devices.
Evernote's web clipper is incredibly useful. I have not found any other alternatives that are as robust and feature-rich as Evernote's clipper. I use it all the time to create a personal archive of various topics.
It is also available everywhere; switch to another device, install a fresh copy of Evernote, and you have your entire digital world synced for you in a matter of seconds, and ready for you to start working. It's incredibly useful.
Context matters, too. Sure, you can sync a pile of files via iCloud or Dropbox, but raw data without the context is just, well … raw data. It is the context that turns data into knowledge, and Evernote helps me establish a web of context among the data I collect in it. It is why I once tried to manage everything in a pile of plain text files and miserably failed.
And so many apps and services can connect to Evernote's APIs, so it can act as a hub of every knowledge I need to maintain.