Dreadful. Flips destinations when you're trying to amend flights in what seems like a deliberate attempt to catch you out so you have to make more changes. Lets you change your flight out for a flight out, but then won't let you book your flight back for a date after that! Changing flights on it is a nightmare and seems designed to drive you to the call centre where every single ticket has a £20 mark up to encourage you to make changes on the app and the website that don't work