Simple to use, feels like I'm "doing something" by planting a tree and setting my phone down. I've gotten my 5-year-old to sit still and watch the plant "grow" for over 20 minutes... We like saving enough coins to plant real trees! The new limited edition trees are exciting to watch for and try to earn, but it's nice that you can buy them later too. Pretty art, fun app, AND plants real trees!? I love this app.