I made a booking but used the wrong dates. The site had quoted there would be a cancellation policy within four hours though. I called them and they told me it did not apply for my particular company. I think the cancellation policy is misleading, since it was clearly quoted which company I was travelling with.
When contacting customer support, they we're offering to change dates, but at a huge sum. They were trying to persuade me to make the booking although they knew it would be of my disadvantage and their advantage. Also, they tried to sell me additional Hotel and Car reservations, knowing that a lost a lot of money on them.
Another time, when I didn't show up at my flight to Rome, they automatically cancelled my return flight - no refund, no possibility to change.
Also, the site offers no insight in the booking with your airline company.