Except for the plastic keyboard, I don't see any advantage. Use a decent Jabber client (I'm using Beem on Android) and you get all these features on gchat, with just your gmail address.
Plus, figure out the priority thing right, and you can have all the messages delivered to the right client. GTalk broadcasts to all clients by default, but the better IM clients give you an option to send and receive.
Hugh Akston in Atlas Shrugged:
"Contradictions do not exist. Whenever you think that you are facing a contradiction, check your premises. You will find that one of them is wrong."