We visited this place as a family (2 adults and child at the age of 3) on a gloomy Friday in December 2017. We planned to stay for the whole day but in the end we spend solid 4 hours here. Place is only one hour distant from Bratislava, therefore it was our first but definitely not last visit here.
We liked warm pools where you can relax but also kids' attractions where our boy could play and we could be with him in the water. They have one of those super hot pools where you can swim outside while enjoying the warmth of the water.
First we had to get oriented as the kids' pool and attractions are not in one place with the warm pools and the main swimming pool. With little bit of assistance we were able to find and enjoy everything.
Be aware that wearing a swimming hat is a must when you want to use the main swimming pool with the swimming lanes. Other pools are accessible without swimming hat and here you can enjoy both inside and outside parts of the pool.
As we were visiting on Friday afternoon, there was no issue with parking. They charge 3 EUR for full day parking.
In the winter time, swimming and water possibilities are limited to indoor pools and those pools which also have outside pars. Good for couples or families with small kids. Teenagers could be little bit bored as we did not see any specific attractions for them beside two big indoor toboggans (only one was actually in use). Staff is relatively friendly and the place is clean.
We would definitely return here and we would recommend our friends to check this place.

We were there after the season was over, 6e for 3 hours, we had nothing to complain about (I'd like the swimming pool to be open longer, but I understand that it was getting cold there).

Vaste of money if compared to Hungarians thermals... Boring town, "thermals" = average aquapark,1 warm and several cold-water normal pools, paid switchback, rude staff,... The level of services does not match the price level.
There are just Czech people coming there, I did not see anybody else.
We tried for 2 days, but nevermore.