I would definitely use this company. I have used them twice, once to pick me up from Heathrow when I had guests arriving. The flight arrived at 8:45, but the driver was waiting from 6:30am, monitoring the flight, and he kindly waited while my guest sorted out a lost bag. I used them again to pick up my guests for a noon flight, and I had them arrive at 8:30, and they arrived promptly and waited outside, and knocked on the door politely at the exact time I asked. Courteous drivers and prompt service. You want nothing more when dealing with an airport transfer. Would highly recommend.