Well look at the alternatives: (1) join dropbox, probably for a pretty penny with stock options that will probably look very nice when Dropbox goes public -- f

Well look at the alternatives: (1) join dropbox, probably for a pretty penny with stock options that will probably look very nice when Dropbox goes public -- fuel further growth and integration with Dropbox with even more significant resources at your disposal (including HIRING really good engineers a la "come work for Dropbox!") (2) stay as a high-risk start-up with no revenue, no tested plans of monetization with huge problems of scale (due to its rapid growth) and create a funding round which liquidates your ownership stake significantly, puts you @ the mercy of some risk averse VC's and limits your exit options (depending upon valuation) I love the product, but I have to admit this (1) would be my choice as well