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I think it is most useful for small companies that are just starting up and are undercapitalized. And by small, I mean really small; one person startups, or perhaps a new business with just a few people. It is cost effective, at least in the short term, to pay to share resources necessary to run a business such as copiers, office space, high speed internet access, etc. Some types of mature business may work well in this model, especially those that require frequent cooperation and coordination, but I'm not sure how effective it would be for many people like myself who value quiet and at least a modicum of privacy and have difficulty mainting focus in the face of distraction. One aspect that I would find very beneficial for single person businesses is that it gets one away from a home office, where it can be challenging to devote one's full attention to the business of business. I know that when I am at my desk at home trying to get some work done, I spend a disproportionate amount of time removing cats from keyboards or answering questions about how much longer it will be before I am done.