The tool is not recommended for users under the age of 14, it has been rated 3.5 on Google Play. Advertisements are a part of this application. The statistics show that the app is popular mostly among Samsung and HTC users.
A free .apk file of MMA Underground 2.3 can be downloaded from Droid Informer and you can have a look at users' reviews on this site. Prepare 1 MB of free space on your device for this app installer and take into account that it requires Android 4.1 and above.
Some users note that the strong side of the app is a good layout. From the users' point of view, you can notice such drawbacks of this application as spelling errors, horrible performance, banner ads and a battery drain.