Emily, it's not really a matter of opinion. Erin is a highly respected cavy caretaker and rescuer. I've used that utility shelving and it is most definitely sound and stable. Her cages are rock solid. It's a very good model for anyone to use.
I surely wouldn't put my pigs at risk intentionally and I could have spent less money on a unit that was less sturdy but knew that it wouldn't be a wise choice for this sort of set up for animals. There were several set up in the store where I purchased this from, aside from it's larger size, it was the most stable when assembled properly.
