I used them with my puppy and never had any problems from the cats. I agree with dbg, you get what you pay for and the ones that may seem expensive are a little better than the cheapies.
However, as I say that, we use pee pads from Walmart in our guinea pig cage and those little bugger soak up a lot! They aren't the cheapest ones they have, and I can't remember the brand, but I find they work well.
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