The only advantages this seems to have over IRC is the ability to embed images and videos. Am I missing something?
The big advantage I see to IRC is how long it's been around. Plenty of clients and setups catering to IRC. And it's not going away anytime soon. Perhaps it's getting a little long in the tooth, as posed by moe at http://news.ycombinator.com/item?id=2069810
I have too much free time.