My biggest complaint I have had so far with my 4runner is the front edge of the hood getting all beat up. I read that the bug shields don't really help with the design of the 4runner (you still get your windshield splattered with bugs) so I just wanted something that covered the front edge up.
I thought about the clear bra and wasn't too crazy about it. Then I saw pics of a member's 4runner (RIDE) and really liked the look of the Aeroskin.
It is basically held on by 3m tape and that's it. The install was really easy. I wiped down the edge with alcohol wipes that were provided and then lined up the aeroskin on the hood. What was really helpful is I lined up the edge of the 3m tape to the edge of the hood. That seemed like it was a perfect fit and I went with that. I even brought out the tape measure to make sure the gaps were perfect.
You just peel back a couple of inches of the 3m tape and work one line at a time from the center to each edge.
If you take your time and line it up correctly, it turns out really nice. Might have taken me 15 minutes at the most.
Cost about $61 shipped online.
Since it is outlined with 3m tape, I am not too worried about mud or dirt getting under the aeroskin. There were a couple of small gaps on the top where the hood lines started, but the gaps were on the bottom too. Enough for the water and dirt to flow through. I'm guessing a water hose would clean out these gaps very easily.
Maybe RIDE is reading this thread and I know he has been offroading and has experienced the mud and sand and could comment on how it's been holding up.