[gima]

It's available from the normal Chrome print menu, so you can test it yourself easily. But to answer: I haven't used it extensively, but CSS and Javascript tend to make it a bit tricky. When you are viewing a webpage in the browser, you have one viewport, and scrolling can change the appearance or position of elements. Translating this to one long PDF is troublesome on some websites. As to what companies do that provide this as a service? I've got no clue, maybe brand this as their unique service? :D