I bought the largest model (Model 620) of this cage to house two guinea pigs in the plastic pan by removing the grill floor.
The cage is well-built and easy to assemble. However, it was poorly packaged and slightly damaged during shipping. The mesh roof was bent and scuffed and some of the blue paint was scuffed.
(Other reviews have said that this cage does not work well with rabbits because they can urinate down the legs of the cage.)
With the grill floor removed, I'm not very confident in the security of the plastic pan with the weight of animals, food bowls, etc. The two end clips, designed to stabilize and secure the plastic pan, do not work at all. They do not clip onto the pan as intended.
Therefore, the pan easily slides out of the cage. Once the pan is out a couple of inches, it is free to flex and fall to the floor.
Although not recommended by the manufacturer, my solution was to cut the lip off both ends of the plastic pan, remove the top of the cage and slide the pan in so that it rests on the grill floor. The pan fits perfectly this way and is more secure.
Furthermore, if the grill floor is relocated to the slots intended for the pan, the two end clips actually work and help secure and stabilize the grill floor.
Such a large cage on wheels is a great idea, but I think the design needs some work.
Bird Cages 
[3 of 5 Stars]
