According to an article in the Sunday Star-Times, couples are saying "I don't" to civil unions. In the year since their introduction, only 362 couples have celebrated civil unions compared with over 15,000 marriages.
Conservatives will no doubt see this as a failure, and complain about the cost of establishing a parallel system to pander to a minority. And on the latter point, I agree entirely. What I disagree on is the identity of that minority.
Bluntly, the reason we have a parallel system with all its resulting bureaucratic overhead is because of a small minority of religious bigots who felt that they had exclusive ownership of marriage, which they believed would somehow be "debased" if they had to share it with others. We should not have such a system. Instead, we should have allowed gays to use the perfectly good system we already had: that of the Marriage Act.