I purchased the LTT at a Target store. I was in the process of moving and when I finally got it out of the box and tried it out, I had misplaced the receipt. The first couple of days were great. I would use it for about a half hour to an hour a day. I normally walk but wanted something to work on more target groups. Well, after about a week, I noticed a catch in my knee. I stopped using it for a while and restarted a few weeks later. The same thing happened again and the machine began making a creaking noise. I have since discontinued using it but periodically my knee will catch now if I am doing any type of hiking over hilly terrain. I now wish I never bought the machine.