Samsung and HTC users like the app. You are able to get the .apk installation package of Zalo 3.2.0.r3.medium for free and check out users' reviews on Droid Informer. This application size doesn't exceed 30 MB. The app has been checked for viruses and it has been found totally secure.
As users state, you can benefit from the strong points of this application which are a nice interface and useful features. From the users' point of view, the weak points of Zalo are poor performance, unwanted notifications and bad support.