Love mine, first thing i bought, they make the bike feel very light and easy to turn.
As for wheel failures i keep a very close eye on mine and inspect them for damage every time i wash the bike and have never spotted anything untoward, i do feel though that because of the nature of carbon fibre if you were to hit something hard enough the wheel would likely fail completely where an ally wheel would likely just buckle however if the front tyre was to deflate then the outcome would probably be the same depending on speed.