I think edge is fine for production and I am building and will launch the engineyard control panel on edge. That being said I usual;ly like to find a version of edge that works for me and then leave it frozen into vendor until I absolutely need a new feature from a newer version. If a revision works then just leaving it in vendor is the way to go until you needs to upgrade fro more features.
-- Ezra Zygmuntowicz-- Lead Rails Evangelist
-- Engine Yard, Serious Rails Hosting
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