I am using this app for last 6 mounths. And I never face any problem till now. This is the only app in the market that give you a permission to download songs for free. The collection of songs are also good. You can also search song by differant categories like pop-music, classical music.
But the only problem is that, this app is only works for you if you are a jio customer. So very usefull for jio customer.