Perfect for our small (6 lbs) cat.  Fits in her traveling crate perfectly.   
Not easy to clean litter.  Yes the tray slides out but if you have the right amount of litter in the tray, the poo will get caught as you slide out tray.    
Also, very bummed they don't make tray liners specifically for this litter box.  We improvised and cut down a large trash bag.
Still trying to get her more comfortable with the swinging door concept as she's never seen one before.
This will not work for a large cat.
In spite of issues above, its a sturdy litter box and perfect size for what we needed.