Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Buy a used copy instead of the kindle version.

I borrowed this book in hard-copy form from a friend. The regular book is great. It is written in an easily digestible manner while still covering the material in surprising depth. I found the use of figures and illustrations to summarize concepts particularly well executed. I was incredibly disappointed by the Kindle version I bought for use on my Kindle DX. The text looked like it had been scanned from a copy of a copy made on an old xerox machine. Parts of the letters in the text were missing and the general appearance of the text was blurry. The figures did not line up with the text well, and their quality was not good. I want to make a switch to buying textbooks on the kindle. But if the other book conversions are as poorly executed as this one, then I will stick to buying used hard copies. I would rate the hard copy as a 4 or 5 star book, but I have to give the kindle version a 2 for the lackluster conversion.