Do you mean the potty training puppy apartment? If so, we have one in a size small (could've went with a XS if truth be told) and we LOVE it! We bought it before we brought KS home. She was potty trained in no time and still uses it to this day. We have been very impressed. We buy pads from tractor supply for it now. It's cheaper. The wee wee pad brand. You can get a box of 100 for $20. Hope that helps.
I have pix of our set up somewhere on here. We ordered the xpen to go with too.