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First off there are at least two different types of epubs. One consists of nothing but images. To convert it you need to optically recognize it with an appropriate program. The most effective ones are far from free.
The second type has the text already in it. You can use any one of number of programs to extract it. Mobipocket Creator can do so.
The quality of the output is dependent on how much care the creator used on it. Some are just crude OCR output with many errors, but good enough to search by, sort of, which is why many are like that.
PDFs created from text originally can have great text, but since they are not required to store it linearly like in the original, chunks can be misplaced, the images overlayed in the original but not in the deconstruction.
Hence, PDF is the worst format to start from. But it is all many of us have.
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