I too am one of the ones the book worked for, as dd falls fair and square within the levels, which also correspond with her testing - though I'd also agree the anecdotes were much more telling than the lists. I also found the book significantly more useful than the online lists.
I don't know that her sample is really big enough to make definitive statements about LOG, but they were useful for me to fill out our test results. They were also useful to me in the early stages of thinking about dd being gifted and, because it matched what was going on for dd, it convinced me it was something I needed to follow up.
In terms of this test, I don't know that it is something I would pay for. I probably would have prior to dd doing her SB5 because I was so hungry for confirmation that it wasn't all in my head. I think I would have still been unconvinced though, given it's online, it's me trying to remember etc.
