On the other hand, (so people don't think I'm out to badmouth products), Mothers CMX Ceramic Spray is some of the best stuff I've ever used. And I'll continue to use it.
Over the years I've tried about every type of spray, cream, liquid, paste wax and, or coating known to man on my cars. The Mothers CMX Ceramic spray is one of the absolute best I have EVER used. It's very easy to apply and remove. (Wipe on / wipe off), then lightly buff with a large microfiber towel, and it gives a beautiful, brilliant shine.
Unlike the 303 crap, you can easily distinguish where you've applied it. A huge, noticeable difference becomes present. And the shine lasts far longer than anything else I've ever used.
It costs about the same as the 303.... Except this stuff actually works. And you have something to show for your money and effort.