I read the previous reviews before coming, so I kind of knew what to expect. My wife and I came on my birthday and so I received free entry to the pool area, but still had to pay 18 Francs to enter the sauna world. My wife had to pay the full 37 for the pool area (2 hours) and the additional 18 for the sauna world. We thought this was a rather steep cost, given that the pool area does not have that much to offer - no slides or activities, just a few different pools to sit in bubbles. It's nice and relaxing, but it doesn't hold your attention for a longer stay.
Once in the sauna area, there is no pool on that side (which has been mentioned previously). This is a huge detriment, to which they respond, "there are pools just a short distance away from the sauna area". Yes, but then there is the hassle of putting your swimming costume back on, going through the turnstyle gate and then being able to get in a pool. It is also nice to swim textile free in sauna areas, which here is not possible.
Overall, a lovely place, but lacking in several areas and a little overpriced due to that. Totally worth it if you are just looking for what they offer, but many other such places offer a bit more for similar or less cost.