We've used Sun Transfers many times, and have always had good experiences ... until last night. This service works well as long as your flight doesn't change after hours. Our early morning flight was canceled, and there was absolutely no way to reach anyone at Sun Transfers to alert them or adjust our pickup time. It was late in the evening, and no one answered any of the phone numbers listed (we tried both UK and France multiple times). We used the online chat feature and got a representative who said they'd send an email. The email we received was a boilerplate about how to use the online system to contact them. So all in all a very disappointing outcome. We lost over $100 USD, I'm sure some poor driver made an unnecessary trip in the middle of the night, and we still have to rebook another ride with someone else to get to the airport! Don't use this service if you have any concern that you may need to contact them due to travel changes.