"To the question "do we have a decent and reliable implementation of Arc for production systems" the answer is yes."
But arc doesn't get regular bugfixes. The queue bug causes it to segfault, and it was fixed over months without any official support, and it still hasn't been integrated into arc 3.1.
When an outsider asks, "is arc reliable?" he's partly asking, "will discovered bugs get fixed in a timely manner?" I don't want to over-sell arc to outsiders, so my answer is "No."
One of us can maintain a more regularly-fixed variant, but there's several of those and the community hasn't converged on one of them.
