First time I used this company. Very pleased with their efficient timely service. Driver met me promptly outsde T4 Departures building in the drop-off area, and I just simply walked into the building. Upon return, I called them after arrival, then after I had collected my luggage. I was told to make my way to the Departures drop-off area, walked out of the building and received a call from the driver advising me where he was parked. Swiftly walked over and took charge of my car. No quibbles.
It took quite a while until a driver arrived to take our car before departure even though I had called with a rather exact time of arrival. The return of the car was quicker. So, overall OK. If the flight is a bit tight, it would be really important to get someone there quicker.