I have purchased many of these titles. The quality varies widely between titles. The good points are the active TOC and wide inclusion of titles. And the convenience of getting all titles in one download.
The problems seem to result from OCR scanning (I think) - from strange intrusions of numbers or characters in the middle of the text to replacing every quotation mark or apostrophe with a question mark.
Apparently there is NO proofreading or quality control.
I had contacted the publisher directly last year about some of these problems, and they replied that Kindle formatting was difficult and they weren't spending a lot of time trying to fix any issues.
So - if you're looking for quantity purchasing (and aren't driven nuts by recurring strange characters or mis-reads of words - esp. foreign) go for them. Otherwise download the individual works from free sites.
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