good stuff! for general working the muscle. And it has the advantage of still workin well when you're wearing a thin clothing layer.
a good self-massage is still better, but usually means hand directly to skin and muscle, no clothes, which may not be 'convenient' at times.
some old cycling or running tights or just a light pr of jersey pants and the stick is still effective.
I do recommend using it (or any firm or strong massage technique) on muscle in one direction and that is always in a direction towards the heart, not away.