Google Play displays that this application is rated 4.5 by its users. The app is very popular among Samsung and LG users. A free .apk file of 3C All-in-One Toolbox 1.8.1 can be downloaded from Droid Informer and you can have a look at users' reviews on this site. Prepare 12 MB of free space on your device for this app installer and keep in mind that it runs on Android 4.1 and above.
From the users' point of view, you can benefit from the strong sides of the app that are a clear interface, useful features, auto updates and a battery manager. As users state, this application features the following drawbacks: annoying ads and minor bugs.