A bit disappointed that the prices are crazy high for what you get, $270 dollars for a 45 min hydrafacial is steep, let alone $466 for 1h30. And $130 for a 30 min back massage is meh.
If I remember correctly, the spa at the emirates first lounges is much more affordable, and inviting with the 15 min free things.
However now that I think of it, lots of these facials, like the hydra or micro are best done when you aren't travelling, dry, or drinking alcohol...but I can't pass through AM without a few glasses of champagne :P