Pretty good and enjoyable game. LOTS of pop culture references mixed in too! They have regularly timed stories, or events throughout the year. There is an in game premium currency you can purchase with real money. But I have over 5000 gems just from playing for the past year and a half. I just use them to unlock past stories. The main storyline is plenty lengthy to keep you engaged for a long time though. Biggest drawback I have is how easily you consume energy before running out sometimes.