I've been trying to use chat in WME but it's not easy mainly for two reasons:
First, if the chat window is minimized to increase working area, the notification for new comments/messages is barely visible, I often miss there's something new unless I'm actively waiting for it and looking at the icon every few minutes.
Second, there are no time stamps, when I finally notice that something happened I can't tell if it was a minute or a hour ago, and if it still make sense sending a reply (normally, when I reply I end up being ignored, probably by the same reason I didn't noticed someone was trying to chat in the first place...)
I think if Waze could improve those two points it would be much easier, at least for me
, to make a real use of chat.