I love it, if I ever get another puppy, I would love to have this. Hubby made one for Joey, and it cost over $100 to make, someone borrowed it and moved away, so I've been keeping my eye open, just in case. By the way, Joanne Fabrics sells extra wide thick vinyl fabric that would make great flooring for this. For climbers, we found that the fabric screening that home improvement stores sell, works really well. There are some reviews on the site you linked, one breeder hooked several up together.
http://powerreviews.s3.amazonaws.com...84348_full.jpg Also some people say that as the puppy get older you can just use a couple of the walls for gates to block off rooms.