A few years ago I sprung for melodyne editor, actually before the basic version was included in sonar.   I just did the upgrade yesterday.  I have a question... exactly what did I pay for... I use it in the same way I did before... and I have to say... it is extremely cumbersome to tune each and ever track .....  I kind of long for just the antares slap a corrector on it thing.   
 
So - 100 bucks... what did I pay for..?

The Melodyne feature matrix is here http://www.celemony.com/en/melodyne/editions-and-technical-matters
 

thedukewestern
So - 100 bucks... what did I pay for..?

 
Absolutely nothing if you don't take the time to learn how to use the additional tools and features:)
 
Annoyingly there is no current manual, but there are lots of videos here: http://helpcenter.celemony.com/hc-2/
 

tenfoot's  link above also takes you to an online help/manual that's updated, well organized and pretty handy. http://helpcenter.celemony.com/hc-2/
 
There's also a 13 page "Melodyne Introduction" that provides the basics, but you probably already know those.

Actually I stand corrected - been a while since I visited that page and there is actually a link at the bottom to download the complete manual as a pdf. Good news:)
 
http://helpcenter.celemony.com/pdf/melodynestudio4_English.pdf
 
Thanks brainbow:)
 

thedukewestern
So - 100 bucks... what did I pay for..?

Tempo tool and updated detection algorithms.
 
But you have payed too little and too late: it was possible to upgrade Editor 3 to Studio 4 for under 150 

the way I use Melodyne, I don't really need the editor version.
however the tools included in the editor version will allow you to make more edits and changes.
fix vibrato, exc.