Slack is good but it's nothing revolutionary that would merit the valuation. My main argument against their crazy valuation is that there's no lock in so it'd b

Slack is good but it's nothing revolutionary that would merit the valuation. My main argument against their crazy valuation is that there's no lock in so it'd be easy for teams to move on to the "next big thing." Also, see http://getkaiwa.com/ http://getkaiwa.com/