The Breg Polar Care Cube (I call it an ICE BUCKET), is a 'Jim-Dandy' real pain and swelling reliever. In our case it was purchased to relieve pain and swelling, post-knee-replacement surgery. It works VERY well. A full bucket lasts us up to about 6 hrs. which is a good amount of ice therapy time.
The machine is very quiet and easy to maintain (easy to fill, implement and empty). Be sure to have plenty of ICE because it holds more than you may think. I went to Wal-Mart and bought a couple bags of ice from them. A bag the size we have, here, will fill the BUCKET twice.
While using the ICE BUCKET, the dressing (portion fitting over the knee, in our case), can get wet due to condensation. If your surgery wound is not covered with a water-proof bandage, already, I recommend placing a plastic sleeve like a gallon-size baggie or kitchen plastic wrap between the Polar Care Cube's dressing and your wound's bandage so as to keep your wound dressing dry.
The ICE BUCKET was only needed, in our case, for about 3 days, or so, post-surgery and THEN AGAIN, post-rehab therapy, to help with post-exercise pain. Your body should be able to 'tell' you when you need it...