Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.

Excellent product. I was having difficulty hearing and also getting a comfottable fit with the included ear hook that came with my Jabra JX-10 Series II Bluetooth headset. I removed the hook and attached one of the 6 gels that came in the pack to the headset and found that the volume increased 40% and I was able to achieve a comfortable fit. The headset is small enough and light enough that the gel holds the headset in the ear. I was about to give up on this headset (and all earhook type Bluetooth headsets) prior to getting the gels. If you are looking for a comfortable (and econimical) alternative for earhook type headsets, I strongly recommend that you give these a try. They are well worth the price.
Positive

All the elements of a great movie. What can I say, I love to study the elements of war, and I enjoy a good love story along the way. This movie was a great introduction to the role airplanes had in the first World War. Featuring the story of the Lafayette Escadrille, and the role Americans had in the early aerial engagements. The story also allows those who have little knowledge about early technology to understand that it was very rudimentary. (Using hammers to clear your machine gun comes to mind.) The soundtrack was very well done, and the needed animation(?) was excellent as well. I highly recommend this movie.
Positive

While there were some nice pictures and helpful information I was abit disappointed with the book in general. It was short (92 pages of large text),with no color pictures and just didn't seem like that helpful of a book for a first time mother. The book was first published in 1962 with an update in 1982 and I'm sure there have been quite a few new discoveries that would be quite informative for a first time mother since then. I felt like I was reading a high school biology book. OK for what it was but I'd not recommend it.

Negative