I've used Stop Motion Pro before and have now migrated over to DragonFrame (Which I used to make my BRAWL film, btw.) I've used Stop Motion Pro for ever single film I've made before.
At first the program functioned well for me. But as I went along, the program became very prone to crashing (there were several features I was unable to use because the program would just crash and blue screen when I tried). This started in about mid-2012, and from here on it was all downhill.
Since the program uses the full resolution stills when playing back your film while you were in the middle of animating, I was unable to make a film in any resolution higher than 480p because the program would suffer horrible buffering problems that made me unable to tell how good my animation looked. Keep in mind, I am able to play full HD videos anywhere else on my computer and suffer no lag.
After two years of putting up with this bull, I finally decided to just give up and make the switch to DragonFrame.
AND IT IS WORTH EVERY PENNY.
Playback is always smooth mid-animation, the keypad is a god-send and it speeds up my work immensely due to not having to touch the mouse most of the time or figuring out shortcut keys, and it pretty much has all the features SMP has except for in-program masking (which I think most people who are using this program will be well beyond using, as it only offers very basic erasing tools).
Also, arc motion looks freaking amazing. And since this program is used by basically every animation house worth their salt, you'll be ahead of the curve if you ever choose to go into pro-animation by already knowing the program.
All in all, GET DRAGONFRAME. I know that the lower priced versions of SMP look enticing, but Dragon Frame will pretty much be all that you need for anything you want to do animation wise. I do not know if the problems I experienced were also seen by anyone else, but even so, DragonFrame is just a little more money for a lot more functionality.
Youtube @TheRealSonjira I consider it a personal defeat if my pee is not perfectly clear every time.]