We've got the 3M Sctochcal on our Black MDX, and I WON'T buy another car without it. Absolutely wonderful stuff, but not cheap. I love the feeling of driving down the road, hearing the bugs splat (not that part), and knowing that it will whipe off, and not damage the paint. But please understand that it will get damaged over time, just like a painted surface, but it is easily replacable.
To maintain it, you wax it (Zaino, my preference), just like any other part of the car.
We actually had it put on the back bumper as well, where everything is dragged across the edge.
As to removal, I haven't had the need, but I was told that it is easy to remove. But instead of peeling it back, which leaves the adhesive residue. I was told that you peel back a corner, and then stretch it toward you level with the surface, and it breaks free of the surface without leaving a lot of residue behind.
Recently, my wife hit something in the garage with the front end, and left a scrape mark across the Scotchcal on the front of the car/truck. And while only part of the scrape could be removed with polish, etc., my blood pressure was much lower knowing that a year from now, when it's beat up even worse, I can just replace it.
I paid about $500 for the install, but that includes the entire front bumber cover (had a piece specially made for below the fog lights because the kit didn't cover it), and a portion of the hood, as well as almost the entire back bumper. I consider my self to be pretty handy, but after watching the installation, and given the expense of the material, I would let a pro do the install.
By the way, Black is the absolute worst color, as it shows any small bubbles or imperfections as white. Lighter colors work much better. But even give the more obvious (but very small) imperfections because of the black paint, I would not hesitate to do it again.
As said, it is marketed under many different names. To me, the deciding factor on which "brand" to use is the extent of the coverage. At least one of the more popular brands had very poor coverage on the hood.
By the way, a thicker version of Scotchcal is what is used to cover headlights.
Hope this helps.
Dean