I have many of them and routinely use them for hospital cages, recovery cages and for temporary housing for rescues. They are also great with some special needs gliders.
They are lightweight, so very easy to move, they are compact when packed up and not in use, and they are super easy to clean.
I use 175 gallon and 260 gallon for living in, 100 gallon and 65 gallon for traveling, and 38 gallon and 22 gallon for hospital cages.
Here are a few of mine:
This one was used for a glider recovering from multiple injuries:
This one is used as a play cage for a special needs glider (it is a 175 gallon turned on its side):
Some for living in: