I really like Action Movie FX and would want to see how this compares. Yes, I could just download the free one and then see how those work, but I guess I'm just lazy.
Also, as a note, it seems like your additional effects are three times of Action Movie FX, six times if you figure that they put in two per pack. I'm sure you were aware, but when you're second to the market you have to work with what the market will allow... or you have to be a lot better than what was there first.
Best of luck with the app... As a video producer in real life, I love seeing things like this come out.