At our school we are fortunate enough to have a food tech room, where my group trialed a quick pop maker, called Zoku. Here is a list of pros and cons.
This product was really easy to use, there were only a few steps and it was undeniably efficient. One flaw though, was that the orange tool you use to remove the quick pop broke with minimum use. Overall I think that our experience with this product was quite enjoyable and I recommend you try out the Zoku Quick Pop Maker.
We made a smoothie for this with berries milk and yogurt, and then put the mixture in the molds. We then left the ice blocks in the freezer overnight to freeze.