I tried the 3M 90000 Paint Defender Spray Film on the spats and I'm pleasantly surprised with the results.
I started with the spats because they were smaller and easier, I touched up a couple very small chips, before I started. I masked off the passenger side spat, strategically covered the surrounding areas and tires with a couple old / cheap drop-cloths. Then I applied the supplied wax (to remove it easier later). After removing the wax and giving it a buff, I applied the film as the instructions specified. I applied it a little heavier down low, because the passenger side seems to take more of a beating than the drivers side (more gravel on that side of the road). It went on pretty well at first, but I did notice it start to spray and spit blobs after using it. I got better on reducing those on the second spat, but to tell you the truth, it is self-leveling (even on a vertical surface) and after it dried, I really didn't notice it. It looked rather cloudy at first, but seemed to dry clear and surprisingly smooth after a couple hours.
Hard to get a good picture, but this is right after spraying and removing the masking while still fresh and wet.
This is after it dried for 4 hours, this picture does show a little bit of orange peel, but the flash really exaggerates it.
Without flash, it looks much better. It's hard to tell from the pictures, but I really didn't notice any significant imperfections in the finish. (too many reflections in these pictures).
Drivers side. I had one spot on the edge of the fender that got flubbed, because the masking paper hit it as I was removing it. Actually, it looked like it almost disappeared.
Overall, I'm pretty happy with the results, given the cost and time invested. Additionally, I knew if I really didn't like them, I could peel them off.
I also applied it to the nose, but it was more challenging to mask off and spray consistently, but it still came out very good and has been protecting my paint for about 4 months now.
For the price, I highly recommend it.