Will this scale past 150 employees? (I know, that's a high class problem, but it will come if they are successful.)
From what I've read[1], scaling of the small development/production groups is the pitfall.
[0]http://media.steampowered.com/apps/valve/Valve_Handbook_LowR...
[1]http://www.wired.co.uk/news/archive/2013-07/09/valve-managem...