Yeah... we debated this a bit in some of our groups. But most of us already had Slack running for work at this point. Ultimately it's the same thing as ICQ / AIM / IRC / Skype / you name it... literally all the same functionality from our perspective. Came down to just "What can we use that we like and that doesn't require us to have to install / monitor another blinking light on our computers?"

People should use whatever they are most comfortable with.