$8 AUD is a bit steep for me at the moment (OK, maybe I'm cheap), considering that I shoot Tri-X @ ASA 400 90% of the time (got that formula etched in my head). I'll certainly get it if/when it gets a bit cheaper or when I move to experiment with other films/developers more.
A great looking program though.
***edit***
looking through the comments, seems like a great program but the main thing holding it back is the (relatively/perceived) high asking price.... I would think that if the software developer wants a break (in any iphone app), release it for a cheap price to get the word out. I assume that if the price was, say, 1/4 as much as the current asking price, MORE than 4x the people would be more than willing to pay for it....