We're still in the "modeling stage." We hope that Caroline will eventually use this system expressively. At this point, Mike and I are each using PODD twice a day for a few minutes. Caroline also takes her PODD book to school for her teacher and therapists to communicate with her.
Here's a video of me using the PODD book to talk to Caroline (DISCLAIMER: I may be messing up to the point where what I am doing may not even be considered PODD anymore!)