They are a beautiful looking moth, but the caterpillars that arrive later are not to my liking. They chew up the leaves on the oleander if left untreated, and can decimate your bush if no action is taken. There is a spray you can use, which helps when the caterpillars are small. I've had the best luck just hand picking the larger ones off our oleanders, in addition to spraying. The spray is called bacillus thuringiencis, and is safe to use in gardens where there are other flowers you need to be careful with or where your pets might be.
They also spray with Permethrin, which is a heavy duty chemical highly toxic to cats, and a known carcinogen.
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