I thought that this was the pen that I wanted when I started looking, but I was not sure that I could get it in time for the arrival of my puppy.  I considered other pens, or whether I should buy it somewhere else (where it cost a lot more), but Wayfair got it back in stock just in time.

I am really glad that things worked out that way; it was really easy to put together and easy to shift around if you need to.  You can use as many of the panels as you want although I suspect that you would get best stability with all eight.  Great product.