It works  connects with BART API so ETA's are as accurate as can be. It even provides a +- accuracy to let you know potentially how many seconds it might be off. Have been using it for years with great success. Hopeful developments for future: Ability to add widgets/shortcuts for homescreen to allow for one click quick view of a specific Favorite Route  or even a dedicated widget on the homescreen that constantly shows a specific Favorite Route ETA would be cool. Potential support for Android Wear in the future would be great too. Would be happy to donate to support developer.
March 31 2017