I have a lot of shoulder, back, hip, and thigh pain so I've tried several different types of massagers on Amazon Vine. This one is the most successful. It successfully released my thigh trigger points, which is a major problem for me. It also helped some with my shoulders. One odd thing is that it really bounces when you put it on a bone. It's not necessarily painful when you hit a bone, but it bounces off entirely. I've mostly been using the first setting, sometimes trying out the second or third. I can't imagine getting to the 9th speed, but I'm new to percussion massage. As for the attachments, I've mostly been using the ball attachment. It's somewhere between a ping pong ball and a tennis ball in bounciness/firmness. I tried out the air compression/accordian head on my stomach. It does even it out a little bit but it still didn't work for my stomach. It seems like a nice alternative to the ball. I have not yet tried the other attachments. The flat head, cylinder head, spade head, and spinal head are all hard plastic, and I worry about using them with this powerful machine. It also seems like the spinal head is not going to go around my spine enough. This massager has a nice length to it so I can reach the middle of my back myself. It's also on the heavy side, which means that I don't have to push hard to get it to work. However, if you've got joint pain or a weak grip, this might not be for you. So far the charge has held through multiple sessions.