Geektastic: I've yet to see a building report I consider worth the paper it's written on.
The lack of the equivalent of the RICS qualifications in NZ for (in this case) Building Surveyors means that pretty much anyone can produce building reports, rendering the usefulness of them extremely difficult to determine.
When I sold the house I'd been living in for over fifteen years, I got a Building Inspection report which I made available to potential buyers.
One prospect pointed out something that I hadn't noticed, but was a significant defect - several thousand to fix - and wasn't on the Building Inspection report. The Real Estate Agent had to amend the disclosure statement to include this fault and email out copies of the amended disclosure to everyone who had previously asked for a copy. It could have been professionally very embarrassing for the agent and expensive for both of us. Neither of us was impressed with the "Building Inspector"