The three-ring binder was a nice idea, but two major flaws killed the execution of that idea IMO. First, they printed double-sided pages with a different monster on each side; that meant you couldn't merge Compendiums and keep your monsters in alphabetical order. And second, both the pages and the binders themselves were far too flimsy. Unfortunately, I suspect the cost of fixing these issues would have been prohibitive (limiting monsters to one per double-sided page jacks the page count way up, and making the pages out of heavy cardstock or plastic would make them much more expensive to manufacture, ship, and store). I'd love a return to the MC style if they could fix the problems and keep the price reasonable; failing that, I prefer old-fashioned monster books or digital delivery.