I really am impressed with the quality of this carrier!  It is very sturdy, easy to open, get the animal(s) inside, and close.  
I ordered a medium, and thankfully, there is room for two large cats.  The only drawback is the lack of wheels. I don’t remember if that was an option, but it is something to think about if you are transporting more than one cat.  Other than that, I am very pleased.