My wife and I have both benefited from the Aircast cryo-cuff on knee replacements and shoulder surgery. Love the pain relief they provide. In fact I'm using it as I'm writing this review.
We have used the Don Joy cryo post surgical icing system for 4 different family members after six orthopaedic surgeries. We rate the system as good to very good with the shoulder cuff to be just okay. Perhaps our unit is just getting worn out, or the surface are of the shoulder cuff, is just to big for this motor.
Don't waste your money on this ridiculous, difficult-to-use system.