I like having the separate federal offices. I think it makes sense for the provincial and smaller jurisdictions to have the combined oversight, but at the federal level it has been nice that some of the spokespersons who have represented those offices on the national and international stage have represented Canada very well in talking about privacy rights and access to information rights. You can get into very fundamental issues of society and democracy.
I like the idea of having them separate at the federal level. Whether there are efficiencies to be achieved I'll leave it to those commissioners to comment on.