I have tried the classic "The Stick" and that does a pretty good job. And physical therapists also recommend using a roller to roll out on the floor, which I find incredibly painful and awkward. This found all sorts of painful areas, including muscles, fascial adhesions and trigger-points while being controllable. http://gomoji.com/shop
It says it can be used all over. It will get into your glutes, quads, hamstrings, angles, knees, feet, and neck. It will not be useful for your psoas muscle and I don't like it on my lower back. Your upper back will like it, your arms, and your chest (if you are a body-builder type), but you'll need partner help. My friends who also have muscle problems are playing with it at my house and are pretty amazed.
The only way I would improve it is to have rubber-dots inside the grip area (the orange part). Most people won't want this and it would shorten the longevity of the product, but as someone with arthritis, I'd appreciate it. But don't let that hold you back. Worth it!