I'm at a Clay Animation training session sponsored by my employer. I've done stop motion animation before, but not with Frames.
I'm really liking Frames. My previous animations have all been compiled in iMovie or (against my will) MovieMaker. Those programs work, and are often pre-installed on computers, but Frames was designed specifically for stop-motion animation. Most of the concerns I had going in were resolved in an "Oh, so it can do that" way, followed by an "Oh, you mean it can also do this?!" moment.
I'd write more about it, but I have to go back to playing ... er, I mean learning how to use this software.
(Oh, and if you liked the music, Bre Pettis made it.)