I bought a larger size then needed for my Shih Tsu. Which was the medium.   I took the divider and cut out a walk through with my Dremel so my puppy could have a sleeping area and a place she could go potty lined with a potty pad.   This worked out pretty good but she now goes potty outside so I have removed the divider and put a dog bed in there that fits the entire crate.  I will downsize soon as she doesn't need all that room but it sure came in handy while potty training her.

Pros: Thick Steel, Double Latched, Removable Tray, Divider
Cons: Can't open both doors when divider is installed, Wish doors were removable.