Evernote - Remember Everything
I use Evernote religiously but never needed the Pro version. The free version of Evernote is more than sufficient and enough for me. However, I've subscribed to the Pro version for quite sometime.
I subscribe to the Pro version because I love this software. It is "love" just as Phil Libin have emphasized many a times.
Get Evernote, it works everywhere - Desktop, Mobile, Web. Most of you will never need the Pro version, it is perfectly OK to stay with the free version and use it to its full.