I own a LF+ Pro...It can do soooooooo much, technicaly even more than a RJM Mastermind (i dont own one but read the manual, checked the editor etc...)
First question is, do you have the time and patience, backround to programm third party advanced midi controllers, and do you need all those extra features. If not, FC12 is the way to go.
But the biggest, most important point.
STAY AWAY FROM FAMC MUSIC. This is not a professionaly run company, i have some issues with my unit since some weeks and found a bug in the firmware. And FAMC doesnt respond to anyone since weeks or months. Neither to email, nor to post to their official support system, or to messages on their forum.
And they dont even have a phone number available, i think this tells already all. If they had a phone nr available they would be daily in big trouble with bunch of people calling and complaining.
Yes the controllers are great (hardwarewise not on par with RJM stuff but as i mentioned i believe LF+ has more features/advanced programming capabilities).