I'd had a double knee replacement. This is wonderful! Incredibly easy to use. It lasts all day. My only issue is that the battery is very tight and hard to get on and off. I usually have to have someone else snap it in place. It works great for me because I have people with me 100% of the time. A close friend of ours had a hip replacement and had purchased one but never used it because he was alone. He had no one to fill with ice and water and carry to the living room for him. I, personally, would never have another procedure like this without using the Breg. I also love the fact that Breg is the only company that offers a battery system instead of electric. One less cord to trip over.