Is this any good for cats?
No. Though this is a very good trap it’s too small for a cat, even a bit too small for squirrels. Great for chipmunks though. Look at some of the Havaheart traps. You can send Haveahearts customer support an email asking to recommend a size for a cat and they will get back to you. They are a really gook group to work with and make a great product.
Ordered two of these a few weeks ago. The two I received were different sizes. One is smaller than the dimensions specified and definitely not big enough to catch anything as large as an opossum. Maybe a rat or small squirrel. The construction is OK, but again of varying specs with the smaller of the two using different wire screen. Some metal parts needed to be bent back into the proper shape before first use.