Comes off cleanly. Buy the stuff off eBay, it is dirt cheap.

And I think ti comes in different colors, but predominantly is sold in a clear color. Depending on the color of your car, it would be visible until about 20 feet away. That said, I would much rather have that and pay $3 for the 3M stickies than pay $80 for one of those euro brackets. Plus, I was worried more about resale than anything else so the 3M stickies were perfect. Even if it does take a little paint off eventually, I can just touch that up for a few bucks and you won't even notice (my car is black though so that is easy to do).