In many of the practice drills and tests the key does not match up with the answer choices, and often explanations are hard to understand. I thought books went through an editing process, but by page 77 I have found over 7 errors. This book (2011 edition) is a waste of money.

The headset came safely packaged in a sturdy, attractive heavy cardboard box. All the optical elements were protected by a thin plastic film and were pristine when they arrived. The strap that holds it to your head is high quality. I have an iPhone 5SE and it fit well. The instructions were a little difficult to understand, but really, it doesn't take a genius to thread a strap and put the phone in the viewer. I like that the headset allows adjustment for vision issues, and allows the visual field to be widened or narrowed to achieve a perfect "3D." I had previously purchased a similar product from a well-known search engine; this product is much better made and feels like a quality headset. I do find it a bit heavy on my head, but if I support it with a hand that problem is gone. I received this product at a discount in exchange for my unbiased review.