I had my first one put in and it lasted 1 year and was not getting all areas. Decided to have more leads ( I thought) put in on Dec 1,2011. A man not from Boston Scientific but from St. Jude was there. Says you are getting a whole new model. They had already started they anethesia, I wasn't going too far. Woke up with the battery pack right at my waist line. Noone came back to tell me how to use, charge, anything. January I sat down in a chair and had to move the internal box with my bare hands to sit back. Got to the point it started shocking me if it moved out of it cubby hole. Then it wouldn't shut off and started shocking me. I had it removed on May 14. My heart stopped in the recovery room 2 times due to the shocking it had done to my system. Good luck to all they work for I am happy you are blessed to have them work. Just not for me.