I have not done the spa taster.
I have done the booster therapy, which consisted of the hydrobath and the alpha capsule. The hydrobath was horrible! The thermometer read 47 degrees celcius (which I think is about 116 degrees f). I ended up having to get out and get help at the spa front desk. I was not sunburned or anything like that, it was just too hot with water that temperature up to my chin. I also did not enjoy the alpha capsule, but they may have been because of being too hot from the hydrobath - not sure.