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@4idan
Lots of people use them for racing, especially if they have a powertap hub built into a traditional wheel and want to use it in a TT. I've never used them myself but judging by their popularity i'd say they were safe. They are normally made of plastic not carbon, obviously make the bike heavier and more difficult in windy conditions. I think http://www.bike-science.com/ make them custom to fit your wheel.
Sorry i don't know much more about them.