I bought the set about a week ago since it was such a great bargain. I originally learned Perl through some CGI books that just used the language as a means to an end. At the time I needed to learn it quickly to take over management of a site, but now I'm going back through real Perl books to get a better feel for how powerful the language really is. With that in mind, the Bookshelf has been great for me; I've gotten through most of Learning Perl and I'm starting on Programming Perl. Even though I already know most of what I'm reading (in the intro books at least) they've been really useful for learning how to write more concise and functional code. The other great thing about buying the package on CD is the Java-based full-text search engine that comes with it, which greatly increases its value as a reference. Reading on a monitor has never bothered me (having a 19" CRT at 1280x1024x85Hz helps), so that's not an issue. And you certainly can't beat the price. So if you don't have a problem with reading from a screen for extended periods, I'd wholeheartedly recommend it.