Jimbob, I agree the concept is correct and will make the super cooled
water chill the drink. In reality there is not enough of it to make
much of a difference, therefore the heat is lost very quickly, even
doen to taking away the heat from your unit. I have just bought a 1.5
litre Kenwood smoothy maker, which to me is like a glorified blender.
Only difference is it can pulse which breaks ice better and has a
decent tap. Best thing you can do is to make sure all your ingredients
are already really cold. Someone gave me a tip to chill fruit to almost
frozen. I did this with a can of drained peaches and followed a reciepy
which used ice cubes, milk & honey. To my amazement it came out a very
healthy and thick smoothy.

Stu
http://www.cateringappliancesltd.co.uk