[mgkimsal]

only played around with it briefly a few years ago. my view is "probably not unless you've already used it, or have knowledge of some specific PHP issue you know you're going to need that Hack provides". I think 4-5 years ago, there was a point where Hack might have been able to grow out of niche status, but I think that time's passed, with the growing community around 'modern' PHP and the ecosystem provided via composer and frameworks.