I have been wondering that as well (re Away).
I'm getting the hourly updates/notifications for one of my door sensors (the one with the low battery) but not the other.
The sensor with the low battery, the one that I'm receiving the hourly updates from, is the original Zigbee sensor that I received with my Almond.
The one that is behaving as I would expect is an Ecolink Z-Wave Door/Window Sensor (DWZWAVE2-ECO).
Don't know if the issues is from the models and how they work, the battery, or Z-wave vs Zigbee.
Something else that might be of note is that the Zigbee sensor would consistently report an inaccurate status when it was placed further away, however the Z-wave one works fine at that distance. Granted, I have more Z-wave devices, so that would help with the distance aspect though.