There are advertisements in Metal Pro. Samsung and Asus users like this application. It's free of charge to get the installer of Metal Pro, also, you can take a look at users' reviews on Droid Informer. The app works fine on Android 4.1 and above.
The app is totally safe to download.
In users’ view, the strong sides of this application are a nice layout, tons of features, facebook notifications, constant updates and battery optimization. The way users see it, you can notice such drawbacks of Metal Pro as app bugs, poor performance and many ads.