We implement some of the concepts of ROWE, but we don't really measure results in any quantifiable way. We hire the best, most driven people we can and give them the means to produce awesome things. So far so good!
That seems to be the secret trick here, it's more about creating autonomy and encouraging mastery and purpose than about actually measuring anything, or managing anything. And if it works, it's gotta be a nice place to be. Congrats on building an amazing company.