I still have my SOS module, and I think it's neat to have two serious buttons behind a protective cover. But I've been thinking of swapping it out for the oddments tray.
For those who kept the SOS module: Do you subscribe to the service? Have you had to use it? Has anyone who haven't subscribed to the service, pressed the buttons to see what happens? It's like a fire alarm I want to pull so bad just to see if something's going to go off.