We have tried it and it seems to work very well. Unfortunately, we have not entirely moved to Wildfire yet so we haven't had much chance to play around with it. I found the procedure for adding names to your contacts list to be rather klunky. In order to contact someone, I had to have them export a vCard and email it to me. Then I could add them to a conference. That was the only way I could add contacts. Otherwise, everything seemed to work as expected.