Flaky  poorly documented Documentation is inadequate  widgets are unreliable  graphs are poorly coded and extremely sluggish  etc. And to top it all off  it won't properly uninstall on my rooted OnePlus One running Cyanogen OS 13 - eg Marshmallow 6.01. (Possibly has to do with the fact that it installs as a system app on a rooted device. If this is the case  then the proper non-standard uninstall procedure should be DOCUMENTED  and it is not.