The book seems to emphasize more neurology than ENT. There is probably a little too much emphasis on oddball causes of balance difficulty.
I also found a number of editing errors, with occasional confusion of which semicircular canal is involved, and whether there is increased or decreased activity. I don't think this detracts too much from the book, which is still a good review.
From a personal perspective, I would have appreciated more in-depth coverage of test utility. Test results are always mentioned in the cases, but there is little coverage of "pearls and pitfalls" in test interpretation. From experience in using VNG, I find that the results are frequently not straightforward.