The Aneros Helix is aggressively shaped and angled. This model provides immediate pressure and tension on the prostate and surrounding area. Destined to become the new standard because it requires less patience and practice to realize benefits. In terms of dimensions, the Helix is larger at the tip (1 1/16" versus 0.9" on the MGX) and more angled to provide a more vigorous massage. However, the mid-ridge is slightly smaller (1/16" smaller) on the Helix. All reports about the Helix have been wonderful! Specifications: 1 1/16" diameter at tip, circ. = 3.34" 15/16" diameter at mid-ridge, circ. = 2.94" 1 3/4" from main body to perineum pressure point.