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Well, you don't have to buy anything.
Amazon, B&N, Lulu, and Smashwords all allow you to read samples of ebooks.
The samples are large enough, I think, that you will know right away whether the ebook is well written and suits your interests
If you are talking about downloading an ebook directly from the author, then just ask for the first few chapters as a free sample. If they will not give you a sample, that, to me, would be a good indication that their work is less than stellar.
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