LOVE this place! LOVE IT
My first Stillwater experience was amazing. As soon as you are in the facility, you will instantly feel relaxed (ok maybe it's a little exaggerated but the atmosphere is awesome).
I am not sure if Stillwater considers one of the high-end spa places in Calgary, but it does worth the money to spoil yourself and/or your loved ones at least once.
They provide steam room, jacuzzi, cold cucumbers, showers, lockers, hair dryers, etc.
The cons to this is that it's a pain to book a morning/early afternoon appointment on the weekends since a lot of their regulars pre-booked the good slot!