My husband and I have been to both the GF and SSR Spas. We preferred the SRR spa, though both are owned by the same outside company (not WDW). The facility at SSR was beautiful, and the spa itself bigger if I remember right. My husband and MIL enjoyed the facials - I usually treat myself to a spa pedicure, which is also good. I did the hydro massage once, it was nice but not something I would do again.
Sarah (not Mike)