My experience was disappointing: I went to Wanda Fish in Camden, which was a very basic establishment, rather than the salon I was expecting. I was very cautious when I dipped my feet into the big tub of fish, but aside from about a minute of weirdness, it didn't feel uncomfortable at all: in fact it just felt like having your feet in a bubble spa. The sensation was really gentle and soothing. The water was tepid, which was great as I expected it to be cold, but apparently garra rufa are warm water fish.
The problem with fish is that unlike a therapist, you can't tell them to concentrate on your problem areas: the fish seemed to enjoy the tops of my feet, which didn't need any work, and left the soles of my feet alone. I also didn't think there were enough fish in each tank, and that may have affected the performance: other salons say they have between 150-200 fish per tank, but I would estimate that there were only around 50 in mine. So although this had no real affect on my feet, it could be that the experience is better in other locations. I think this kind of treatment would work best in conjunction with a therapist as well, which this salon didn't offer: after my half an hour with the fish I would've liked the rest of the hard skin removed from my feet and my nails painted, which you get with a normal pedi, but don't get with a fish one.
I'm glad I tried it, and it was definitely worth giving it a go, for the experience if nothing else. But sadly it hasn't made any real difference to my feet, and i'm still going to have to go for a proper pedicure to remove the hard skin on my heels, and for a shape and polish.
Love, Tor xx