Don't waste your money on EX unless you for some reason must animate in CSP or if you're planning on making comics at a pro-mangaka level of volume and want every convenience you can get to do so. Everything you can do in EX for comics you can do in Pro too, just using ghetto hacks to do it. EX just makes it convenient. Not exactly worth the much higher price tag if it's not your profession, or if you're just a beginner.
t. used Pro for years, bought EX a year ago, primarily use the program to make comics.