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

Worked like a charm all over England. I haven't tried the other adaptors, but I found my MacBook to work just like it does here in the US, and there was no difficulty plugging into the outlets.
Positive

By something else. This is the worst piece of machinery I have ever bought. Virtually impossible to cut any size tile on the diagonal. Typical imported junk!!!!!
Negative

This was not a good first book to learn SNMP, the basic definitions are poor, leading to confusion. As an example, the definition of a subtype I found in another text (a subset of the value set for a type) was quite clear, then I checked the Simple definition of subtype and found its was useful to "refine the semantics" of a "data object" and that "it may be useful to create a new data type for strings using other repertoires, such as ASCII". The author also notes that the "ASN.1 rules for subtyping are long and complex". (p 34-35). Hello? This book may be useful as a reference after reading other, better written introductions, but avoid it if you are new to SNMP. Also, I recommend that the novice learn ASN.1 first, rather than alsong with SNMP in a combined text. Also, SNMPv2 has yet to catch on, the Simple book focuses primarily on this version, not of much interest if you are working with version 1.

Negative