I think the app works very well. Its very easy to use and helps a lot. The only negative point about it is that it doesn´t have an alert function to remind you that today has a birthday or that in a few days will be the birthday of a friend. You have to check it to see if there´s a birthday coming which is a really bad thing, because if don´t check it constantly you will still keep forgetting the dates. Hope a new version of it comes with an alert function.