I’m really intrigued by the current price of Slack stock. Just still pondering about when to buy, I’m not sure it will drop much further or not yet. Sitting at roughly -9% since IPO?
Maybe they came in with an overpriced valuation and it’s dropping down to where they need to be.
IMO Slack has little competition for what they provide. Slack is all about user-friendly tooling, and Microsoft has forever been the opposite of that 
The user base Slack will be its driving force, they’re only just getting to grips with their pricing offerings and this should improve over time.
Every technical based work team I’ve encountered uses Slack. Which is essentially every modern company. I’m sure that they’ll make it through and think it’s worthwhile - just not sure when as yet.