I used it 3x times, i use my alkaline water and didn't boil it and it came out ok but the ball was not all the way round and the top of the lid would not close even after i pressed it down. The other two ways i used my alkaline water but boiled it twice. The balls came out clear and one i added frozen fruit. I like how you can use it many ways. Having the perfect sphere will take some time but it will always have that print from the silicone on the sides of the ball. Overall, i like it and i would recommend anyone to buy it. It is slow melting so your water or whatever you use stay cold.