Worth EVERY Penny.... It's great to have it on the computer and to be able to zoom in on diagrams when needed, but I do prefer to be able to pick it up off the shelf, instead of always having to fire up the computer. If you're going to print it, be prepared with a couple reems of paper. Its 1,614 pages. I set it up to print on both sides of the paper. With the way its layed out, most of the pages are printed on both sides, but not all of them, so it's over 807 pages.
