Pros :

• It has a great way to learn language visually and effortless
• It is quick and fun where you will be seeing minimalist illustrations and some fast paced micro-games
• You can choose more than 28 language and still counting that you want to learn
• You will get addicted for it is simple and yet powerful
• It can be downloaded both in App Store and Google Play

Cons :

• None as i can think