I've been running this in 5e and converting it on the fly. It's a great sandbox for both players and DM to get introduced not just to D&D, but to the whole idea of a "scenario" rather than a "story." There is no overarching plot to Keep on the Borderlands, just caves full of monsters and descriptions of how they relate to each other.

The reason I didn't give the module five stars is that the importance of not simply having all the monsters attack the first person to set foot in their lairs isn't really brought out. A novice DM may just run this as a slaughterhouse, which will make it a boring drudge right away. When running this module, it is essential to treat it as a living world and have the mosters behave in plausible, meaningful ways, rather than have them just sitting around, waiting to get into a fight.

Only four images, two of them not really what you'd think of when you think "celestial." Can't complain about the price, though.

The art is, of course, high quality, but the selection of images is entirely the off-beat, less common monsters. None of the classic humanoids are included.

This is a decent starting 4e adventure. However, it assumes you are already familiar with the Eberron setting, the dungeon has only a single pathway, and one of the rooms seems to have typos in it. But my table had fun, so I can't say it's bad. Worth the free price, anyway.

There are 27 images in this folder, most or all of which come from earlier editions of D&D. The images are mostly print quality. I would have liked for there to have been more images.