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

[Q]: My husband and I were not able to attend a birthing class, so the doctor suggested we rent/buy a video. We decided on this one, and although the 'teacher' was a bit corny it was helpful. I especially liked that you could fast forward and skip parts! All in all it was a worthwhile purchase and proved helpful to us both.
[A]: Positive


[Q]: An extremely helpful gem on a complex subject of second century religious authority and textual use. For anyone serious about this period and the interelation of cultures, this book is essential. Is it complex and detailed? Of course, it must be to argue the point. Should you buy it? Yes, unless you want to keep running back to the library. I write this only after thoroughly disagreeing with the review above.
[A]: Positive


[Q]: I got one of these for our office. This model is a big step up from the previous model (679) that it replaced. The 679 has only 1 button from which to access all functions. The 690 has 3 buttons so you can quickly access the function that you want. It appears to be durable & accurate. Highly recommended.
[A]:
Positive