I bought this for my husband, who wanted to give it a try because we had three vehicles that needed aligned, and we figured if it works, it would save us a lot of money over the years. This thing works great! We tested it against my father-in-law's truck that he just had professionally aligned. The numbers matched up perfectly. We used it on our truck and could tell a HUGE difference. It's definitely worth it! The videos are beneficial if you get stuck.