I had one at GF. It was fine. They didn't have a large selection of colors when I went though, so, if you are only looking for basics, you should be fine. The spa areas there (changing room, etc.) are very nice. I haven't had a pedicure at Mandara at the Dolphin but have had other services there and it's very nice as well.
Edited to add: I just remembered my DH had a manicure at WL. He enjoyed it, but it's really not a whole spa experience there. Just kind of a nail salon.