It is helpful with tracking the actual numbers (calories, nutrition, etc), but is quite cumbersome and time consuming to input the data. I rarely use any of the meals provided so typing in the descriptions every single meal takes too much time and computing the numbers involves other apps or web sites. But even more problematic is the inability to save that data in a favorites database within the app. This is a major problem in my opinion. The second drawback in the app is the inability to enter steps or other activity manually since the fitness apps available to sync with is extremely limited. My experience with IF specifically has, so far, been successful. But these two major flaws in the DoFasting app make the cost completely unjustified, in my opinion. Now I understand why you don't offer a free trial period. In fact, the best thing about DoFasting is the Facebook page, which has nothing to do with the app beyond the name.