Couldn't wrap my head around EN in the beginning, pushed it off to the side, ignored it for months, then one day, :::poof!::: Evernote becomes the center of my daily life. Definitely an "ah ha!" moment.
Now I recommend it to consulting clients (and anyone else who will listen).
Primary EN client:
Mac Desktop (MacBook Air, late 2011)
Can't live without EN on:
Mac Mini 2012, iPhone 6s, iPhone 5, iPhone 4, iPad Air 2, iPad 3gen, iPad 1gen, and a partridge in a pear tree