It will probably be about as comfortable as it looks, which is to say, not at all. Those are made for weight weenies and serious racers* who really aren't concerned with comfort as much as cutting every possible gram. They're also favored by those who just love the carbon fiber aesthetic, but again are not concerned with comfort.
* The kind of races you might use that seat in would be hill climbs mostly, or perhaps crits. For longer distances, I think even the pros opt for something with a little padding or compliance.