I think you will find lots of discussion has already taken place on this forum addressing your question.
I stand to be corrected but the consensus does seem to agree that the NZTA testing could be a bit hit and miss as the testing officers are rarely motorcyclists.
I did the standard test for my restricted and CBTA for my full. If by "worth it" you mean have a test which meaningfully assesses your riding abilities in a sustained and realistic manner then yes its worth it. If the assessor is any good they will also point out things to work on, even if you are successful. Learning is a lifelong experience 
Shortening the time on your restricted is a pretty nice sweetener.
Life is not measured by how many breaths you take, but how many times you have your breath taken away
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