even I've used google print in fact almost from the time it launched a long time back ..... it's a useful service in that you can search for terms within a book. That's the beauty of having the entire book indexed. It's superior to Amazon's "Look Inside" feature. The only thing is that you cannot indefinitely keep reading pages from a given book. so that's a limitation.
So it's really cool that now this limitation is going to be removed (well at least for public domain books).