I develop all of my applications on Edge, and when ready to move to
production I freeze the edge version it was last tested on.
Overall though, I have found it to be quite stable. There have been a
occurrences, such as the loading issue which spun the Engines into a
cyclical recursive loop. James has fixed this in the edge branch, but
instances may come into effect.
The trunk is a development version, so you can expect it to be a very
rapidly changing environment. Which is stable if you are living in the
Nathaniel S. H. Brown http://nshb.net