Are you keeping it in the octagon shape? If so, it can take up a ridiculous amount of space. Before you take it back, I want to give you another idea of a way to set it up. We set up ours as a rectangle shape. I did one panel by two. We took the last two of the panels and kept them together, folded them in, so that it made it a smaller rectangle. Here's a picture from another forum:
Link to post with picture of x-pen set up