Is it "safe" to use projections in a production environment?

The subject says it all. What’s the risk I would be taking if I were to build an application that relies on projections once it hits the ground running? This beta thing that’s been going on for an eternity is scaring me. Measures can be taken to mitigate the risk, but that’s beside the point.

There have been many fixes to projections and they are getting ready
to go officially in 4.0. That said we have supported them for
commercial support unofficially for some time now.