If you want "takeout", getting the last 10,000 messages from slack is a pretty easy programming exercise. "channels.history" works really well in their API. Considering that one of the up-sells they provide is better searching and access to more messages, I was surprised it was so easy to grab your history.
My team at work is using Slack and likes it. But, honestly, I don't think we'd pay a grand a year for it. We'd probably switch to Mattermost, which we already have set up as part of our underused gitlab server, or maybe to one of Slack's less expensive competitors. Though, there is some incentive for us staying with Slack, we have a couple custom bots. Over the last 2 years of use, the free account has rarely been too confining. Though the message history search isn't very usable, that's probably our biggest pain-point.
My team at work is using Slack and likes it. But, honestly, I don't think we'd pay a grand a year for it. We'd probably switch to Mattermost, which we already have set up as part of our underused gitlab server, or maybe to one of Slack's less expensive competitors. Though, there is some incentive for us staying with Slack, we have a couple custom bots. Over the last 2 years of use, the free account has rarely been too confining. Though the message history search isn't very usable, that's probably our biggest pain-point.