Looked all over for a medium size crate that I could use to contain either my border collie or my cats when necessary.  Many crates were the "right" size, but I couldn't beat the price and quality of this one.  It has a sturdy floor and "locks", the space between the bars will not allow a kitten to slip through.  I especially like the double doors (one front and one on the side) which make it easy to get out a small litter box. 

Pros: great price for the size, easy to assemble and re-fold, carry handle, removable tray for easy cleaning, double doors, sufficient door closures
Cons: none that I can see