Only tried HoD once -Pimlico - and had 60 minutes with Millie. Reviewed her here, and was impressed. Good room, good shower, got a full hour. Nothing to complain about. There are 3 or 4 I'd like to try out - Blake, Jai, Mina - who seem to offer what I want. Millie offered A at an extra £20, which I was happy to pay, and she was good at it.
Surely the point about HoD is that you can chose the one who appeals to you. Many won't appeal to me, but might appeal to somebody else. That's surely what UKP is all about.