I am aware of them - not as tests for entry into extension programmes - but as an assessment used by an integrated school for *all* kids coming in to year 7. I believe this school awards a couple of academic scholarships based on the results, and I think group/stream classes based on the results.
I didn't get the impression they were cog assessments so much as knowledge-based (eg. what do they know already, where are the gaps etc.).
That they were designed by Uni of Canterbury is all I know as well in terms of i.d.