I've made icecream in a similar way with bags inside each other, but this looks easier. Am thinking of buying one (or more!) as presents.
Realistically, if you were going on a picnic, could you put the ice in the ball at home? Would it stay insulated? And then at the picnic site, add salt and icecream ingredients? I can see how it works really well at home/in the garden!
Teasel, At Home - 7th January 2011
Firebox says: It would be tough on a summer's day Teasel, unfortunately the Ice Cream Ball isn't sufficiently insulated to go on long trips. But if you had ice on hand, all systems go!