There are a few things I can think of:
The app only shows when the driver door is open if any of the other ones are they do not show up.
The location does not update like the iPhone app. Only updates statically, more like a series of snapshots.
Like described above I have to kill the app everything to get it to work again.
A lot of times when you switch over to the location tab the map is covered by one of the other tabs graphic.
These issues happen on both my Samsung Galaxy SII and my wife's Galaxy SIII.
Those are the ones I can think of now. For me the only ones that are big problems are open doors not being shown and one and the fact I have to continually kill the app.
Forgot to mention that I passed these along and they let me know the message was received ... so they know.