There are adverts in Rocket Boost. This application is often downloaded by Lenovo and Samsung users. It's free to download the installer of Rocket Boost, also, you can take a look at users' reviews on Droid Informer. The app runs on Android 4.0.3 and higher.
The download of the app doesn't contain viruses or any kind of malware.
As users indicate, the strong points of this application are a nice UI and superior performance. Some users point out that you can notice such a drawback of Rocket Boost as intrusive ads.