It works well for us and is very much a part of our culture. Of the people who work out of the office, I'd guess that only half go in on any given day. Basical

It works well for us and is very much a part of our culture. Of the people who work out of the office, I'd guess that only half go in on any given day. Basically all conversations happen in our chat client and all meetings are in Google Hangouts. Email or Google Docs are used for things that need to persist or be searchable in the future. We do insist that, in general, you work more or less in a US timezone so you're available for "face-to-face" meetings and standups. That hasn't been a problem for anyone yet.