purchase a play and freeze ice cream ball

Trouble is…

I don’t know how well they work, do you????

Does anyone know if these things truly work??? I have seen this on Amazon and am a bit curious as to if anyone has really had any success with these Play & Freeze Ice Cream Balls that come in a variety of colors?

If you have success with them, what size did you choose and would you purchase the same size again, if you were to do it all over again???