I tend to avoid the ultra low cost carriers in the U.S. If an airline doesn’t participate in PreCheck I’m going to have to spend more time in transit, getting to the airport earlier. If they don’t have inflight internet I won’t be as productive. And without a redundant route network, it can be difficult ensuring I get where I’m going in the event something goes wrong.
One other unique feature of low cost carrier life, though, is that it enables people who wouldn’t otherwise be able to fly to travel more efficiently. That’s great from a societal standpoint, but it can also create culture clash. The profile of an ultra low cost carrier traveler isn’t the same as that of a business traveler.