content: Ive been using this for awhile and I like the simplicity of it. It has helped me focus more on my studies. I did pay for the upgrade. My only complaint is that when I switched to a new phone then signed into the app it did not have all my coins saved that I had. It had 295 and I had saved around 700 before switching. Not sure why but its annoying to pay for the upgrade but not have it work properly when I sign in on a new phone. It also looks like Im not getting the upgraded features.