They work well,
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The picture is a bit 'Hollywood'- there's no way they ever make my wheels look that cool, I'm pretty sure.
But they are very effective, and one set is more than enough to reflect plenty of light (but only from the side really, of course!).
They really weren't that hard to put on, but I am only 35. I suppose if you're older they would be harder, but I don't see how anything that is going to stay on wouldn't be?