That was posted in 2011, is there an update? In my opinion such structures make it difficult to raise funding, and in highly fluid markets such as the one Balsamiq operates in, a well funded competition can easily crush you. I have seen several employee owned companies in Healthcare Policy/Research (E.g. Mathematica Policy or SSS), where they are funded by a constant stream of government contracts/grants which are intimately tied to the company and with very low probability of a competitor winning them.