I have used the Dunlop 222 brass slide for the past few months and comparing this rockslide to this, I can tell that I have more control over the slide and quality of playing.
Aesthetically, this piece is gorgeous. One drawback for me is that I feel like I'm not utilising the cutaway to its full potential. With the way I position my slide, I shove the slide over the knuckle of my finger that is supposed to allow me to bend and maneuver the slide.