After using this app for almost 3-4 months, I must say that I am disappointed. Initially the ads weren't that many but gradually the count has increased. For powering up and drawing a libra you will have to see 2 ads which is silly. At this point I feel the only intention of the devs is to generate ad revenue. I hope I am proven wrong and this actually turns into a legit project as I have accumulated a lot of coins already. It's free to join so no harm to the users but be prepared to watch ads.