Makes it easier, which in turn encourages one to use the rotary function, which one of the key points for owning a rotary vise in the first place. Definitely speeds up the fly tying process - palmering hackle, wrapping tinsel, dubbing, chenille, wire, etc...... The wraps are more evenly spaced and tension is more controlled, using the rotary function, especially with the D-Arm - as one gets a 360 degree look of the fly with each crank during the tying process. End up with neater looking flies (probably does not matter to the fish, it is personal preference thing). A few dollars that was well spent in my books. Quality is as good as the vise itself (which is terrific), and no reason not to expect that this item will last as long as the vise. Works for me.