The design of the UI is very clean and modern using contrasting color for the header with the bottom part of the app using white with very readable text. The app also takes advantage of tabbed navigation, which is intuitive. This all adds up to an app that fits will with the Material Design theme Google apps use.
Whilst this is advantageous to the end user (as those without Google play services can still use the apps more advanced features). One distinct drawback of this is that it is more difficult for the original author to make money from this
The app may produce an error message without sufficient explanation of the cause or sufficient level of explanation of the steps required to troubleshoot the problem.