Changed my swing after 75 balls at the range. Worked on getting my swing path coming from the inside. A little tricky the first ten balls. I did blow it up a couple of times, but it held up! Introduced it to one of my good friends and he bought one after our range session. It is a great tool. I think the fastening nut for angle set can be improved on. I notice a little drift on it from the weight of the stick. Maybe some internal washers? I love it and use it everytime I'm at the range. Even use it in my office at home.