Well, you've named two of the major benefits -- while not a 3 star restaurant, the dining is a very plesant experience. The food is very good, and the atmosphere is very peaceful. To be at Heathrow and be seated in a quiet dining area like that and eat a solid breakfast with a glass of Champagne while reading the paper is an experience that will never get old to me.

I also really enjoy the balcony. It is an amazing place to sit out with a drink and take in Terminal 5 and the activity outside.