I go there often because it's cheap. I bought a 3-session Pico Toning package, but the effect is minimal. I guess you need to get it many times.
The facility is clean and nice because the new building was just completed, but there are too many foreigners and the wait is long.
It's in the middle of Gangnam Station, so I often go there for Botox, Aqua Peel, and so on.