Originally Posted by Kurald Galain
And if I did, I would just grab a binder or something; it's not worth paying money for a piece of colorful cardboard that re-states the most used tables from the PHB. Those are the first things you know by heart as a DM anyway, so as a lookup they're lacking in value. $.02
One difference between a good orator and a great one is that the latter knows better than to rely on memory. No matter how many times your players call for a knowledge check, it's unlikely that you'll be able to recite the DC for every easy through hard DC check for five or more levels. You probably have other priorities for your memory than that.
Now if you're handy with crafts, I'll admit that one of the best things you can do is make your own screen. It's certainly cheaper, if that's a concern, and it can be tailored to organize things according to your personal preferences and house rules.
There are advantages to colourful laminated cardboard over a binder. It tends to balance a bit better for one thing. It also gives the impression that you are committed to the task of DMing in ways that the makeshift use of a binder does not. It's a handy place for sticky notes. You can also use it for a wet erase markerboard, which can be handy for quick notes or reminders.
That said, I typically forget to check my screen, mainly because I tend to spend the night running a game on my feet. Out of sight, out of mind, you know? Still, crouching is easier than finding the right page whenever there's a rule call, and it helps me contain my notes, dice, and counters so they're not spilling out all over player space. It's also a good refresher board before your game, sort of the pre-test cheat sheet, if you will.
If enough of that would be useful to you, it's worth the cost.