Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Excellent abridged version

On Upanishads:Excellent read, puts you new lines, way beyond your day to day thoughts. Katha upanishad was the most interesting and captivating as I found the narration very good.On the translation:Translating a centuries old document into English is a challenging task. A word by word translation would be disastarous. Search in the web for Upanishads and compare it with the translation by the author - Eknath. Eknath Eswaran has done a wonderful jobOn the commentary:Some of upanishads do not need any comments are they are very self-explanatory (thx to the excellent translation).But some of the upanishads are very difficult to relate to, and probably needed more commentary.