I read the whole book 15 years ago. It was a waste of time and money. The only new thing I found was a Turing Machine with (iirc) 1 less tape - the whole book

I read the whole book 15 years ago. It was a waste of time and money. The only new thing I found was a Turing Machine with (iirc) 1 less tape - the whole book could have been reduced to a 4 page paper, as far as new work is concerned.