At the very least these cards are good for keeping track of initiative, which is already a pain. I haven't lost track of turn order yet. But, what you get is so much more than that. You also get a quick reference for the most important stats you're going to need in your game. It's so tedious to have to keep a bunch of tabs in my book to constantly flip open and reference. The Arcane Library then took the next step and filled out the cards for you. They're a little difficult to write in with pencil when writing in spells or abilities, but most common monsters you're going to use are already going to be filled out.
[5 of 5 Stars!]