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I've heard nothing but negative reviews about Chime from amazon employee's whom have to use it daily...
Disclaimer: I work at AWS. I use Chime and love it. Its lack of features is a feature in my opinion. I used Slack for years before using Chime and I’m happy with the switch. I don’t get nearly the chat fatigue I used to get from Slack. Chime reminds me of HipChat and Campfire in terms of UX but with the availability you’d expect an AWS service to have.
It mostly just feels like a byproduct of not-built-here syndrome.