Oh I have heard horror stories...
Not only that, but the flights are super inconvenient. You leave at odd hours, and make 50 million stops. Less options. A friend claimed that there was a cancellation with whatever airline he and his gf flew on. Airline was genuinely at fault. He claims that everyone who booked through the airline website got vouchers. They didn't. The reason, according to the gate agent, because they booked on a third party site. Not sure if true, but that's what he said.
No thanks, I like options. Maybe a bit higher prices, but I always book on the airline website.