UPDATE 26FEB2013:
I bought this app around June of 2012. The amount of new features the Dev is adding is simply amazing.
This app pretty much does it all for the long range shooter. Trajectory, range log (you can use photos of your target and calculate groups!!), HUD, mil range finder, inclinometer....so...many...features...
I found a thread about this app on the snipers hide forums and the developer is very active there asking people what features they would like to see. The crazy part is that a ton of the suggestions were implemented. This app feels like the frankenbaby of someone who loves shooting, coding, and has a touch of OCD.
I strongly suggest this app to anyone with even an inkling of interest in rifles. Just playing around with different variables results in a huge learning experience.
Most of the app is pretty self explanatory, however, I can see where some people might get frustrated trying to figure it out. I know the website has tutorials. Perhaps create a tutorial section that links to the website.
Bloodstriker about Ballistic: Advanced Edition, v4.2.2