Please discuss in the thread the pros/cons you see with possibly switching away from Slack and using Gitter (https://gitter.im/) instead for our community's chatroom.
Update: our trial Gitter is here if you want to test it out: https://gitter.im/LearnTeachCode/Lobby
On the topic of how to go about switching over or testing if we like it, I totally agree with @TheBeege's suggestion here:
...based on my last company's move to Slack. They identified people likely to be early adopters and got them in on it as kind of a closed beta. They helped flesh out the channels, figure out a channel taxonomy, setup custom emotes, and all that sort of stuff. Once the dust settled from all the customizations they'd done, they started communicating out a date to move everyone to Slack and allowed teams to move over early. I think that strategy would be helpful here, too.
Any other suggestions, post em here too!