the benefit of using the Adobe CS is the small size of the final pdf file, which you would not probably reach by using other conversion methods.
The final text looks very nice indeed and can hardly be distinguished from the text of an electronic book.
But to get there, the original scan has to be of a rather high quality.
And even then, it is not rare that blanks get added in the middle of words, making the search process in the file not very reliable.
In some cases, letters get smudged.