Thursday morning, 6am, 5 minutes from a taxi drop off to the BA lounge for a cup of tea and a bacon butty (I can forgive the lack of brown sauce this time!)
Arriving back at 19.30, 15 minute wait for steps to arrive because there wasn't a space for us (had it been raining at Heathrow again?), but once on the bus it was about 3 minutes from getting off at the gate to the Heathrow Express.
i.e. it's great sometimes, but other times it can be a pain when you're at a remote stand