I have the original as hardcover, but also wanted to be able to read on the go on the iPad, so I downloaded the ebook.

It's a scan with OCR. Unfortunately the OCR is bad on many parts of the page - random occurences of %, ' and other characters are common. Also some words are totally unreadable.

Overall, I still read sometimes on the iPad, but having to go back to the hardcover if I'm totally lost.