I have been using google-play store since I have purchased my first android device 3 years ago and I must say it is the best android platform for customers as well as developers. The most amazing feature of this app is that it is an open source platform and anyone can make apps and upload on it and reach out billions of users at a time and can earn money. The in app purchases are also not too much costly in the apps and the paid apps are also available with very nominal rates.