The description aren't detailed at all, but for me that's more of an advantage than a disadvantage. Very easy to use. Great product.

It's what it says on the tin, but the real kicker here is that the PDF purchase also comes with an Excel spreadsheet that lets you edit out anything you might not need and fine-tune it for your games / system.

I cut a bunch of monsters out and reduced the columns to a smaller number that I need for running The Black Hack and it's the fastest monster reference ever!

This is one of my favorite gaming accessories. I keep the hard copy on hand whenever I'm running games--it's small enough to not get in the way and organized so well I can find what I need immediately. I keep the PDF in my Dropbox so I can access it quickly when I'm doing mental prep on the go. The inclusion of a blank page--which you can fill in with some of the 1E stuff not included (I'm guessing for OGL reasons) or your own homebrew monsters--is a nice touch. If you run B/X or Labyrinth Lord and, like me, you're a more improvisational DM who sometimes struggles with too much stuff at the table, this is absolutely great.

I have a hardcopy of the B/X Monster Reference Index as well. It's incredibly easy to read given the amount of information contained. The formatting is excellent. Really eager to start using it.