Using this device couldn't really be easier - it uses the same principle as the plastic moulds that you pour liquid into, only this device turns that on it's head a little by sitting empty in the freezer until it's ready to be taken out and used, rather than the traditional approach of sitting empty in the cupboard until it's ready to be put into the freezer and used.
It freezes liquid in 7 minutes (although thick juices do take a little bit longer in my experience), and it works because it's made out of metal which keeps it's cold temperature when outside the freezer.
The upside of this -
It's fun: children really enjoy making their own ice-lollies, and seeing them freeze (with the normal plastic moulds, this can take an hour or so, and happens out of sight). For adults, it's a cool way to get creative; if you have a juicer, the possibilities are almost endless, and the addition of slices can make for very pretty designs too.
Instead of the usual sugar-laden fare, you can get them to eat healthier things.
The downside -
It's very cold when you take it out of the freezer - little fingers (and indeed bigger ones too, as I've found out to my cost) can get stuck onto the surface!
It takes up space in the freezer, which can be at a premium about the same as a tub of ice-cream). If you only have a freezing compartment, it's not really practical.
The cost is quite high for what it is - it'll take a long time to recover the purchase cost through savings made by use.
Overall, If you have the space and the money, it's a fun product that should see a lot of use during the summer - but those of us who are budget-conscious may well prefer the cheaper
Ice Lolly Maker instead.