I'm too dumb to do pictures, but I can say they are not very large at all and certainly do not stick out from the side of the car. I doubt very much you would notice them if you weren't looking specifically for them. In fact, the first time I noticed my car had them was when I read some forum guy was looking for a replacement, since one of his had fallen off his Mazda3. They're only about the width of the tire, and they appear to be positioned to displace that tiny bit of air before it hits the tread.
If Mazda hadn't put them on, I'd say it would be silly to bother installing them. But as I said, I'm certain Mazda recorded some measured improvement with them.
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