Heh, I don't have any primary characters, I am always the GM in our regular group. The only game I am currently a player in (Hacktastic D20), well... my Dwarf Healer just went to the Great Ale Hall In The Sky in the last session, and I haven't had the opportunity to roll up a new one yet. I am looking at picking one of these up for GMing, however, as the specialized GM screens I have tend to not have all of the info I would like on them.
Well, for that it's literally perfect, but after people have seen me use them for character sheets, I keep getting requests for where to get one. Seriously, two prime sheets outside, secondary inside the first flaps (the "outside") and four pages of reference material on the "inside". Try it when you get yours. It's easy to carry around, you can write on it freehand as stiff as it is, and it stays closed tight enough to keep a couple pages of notes loose inside between games.