Product review (5 stars): Great little machine
Works really well.  Bought it to use for ski patrol at our small local slope.  Most injuries we see use ice and the chemical packs aren't great.  This machine is pretty fast and effective - I bought it 2 months ago and we do turn it off at night although it can stay on.  The ice is hollow in the middle and doesn't last as long as a solid cube but the benefits far outweigh that downside or any other alternative.