Most commercial products that claim 98-99% accuracy are lying. They MAY be that accurate when dealing with a typewritten original from an IBM Selectric or laser printed courier font document, but they SUCK at real-world documents. They generally don't handle skew well at all, don't handle boxes around text, totally lose formatting, etc.
I found it cheaper, faster, and more accurate to send the work off to India and have it triple hand-entered.
Correcting text can frequently take more time than retyping as well depending on the speed of the typist.