What makes RSS unique is it's ability to cut so softly you don't really feel the cut at all. You also don't see any line where you cut.  Also, you can comb out in any direction without even a hint of drag or pulling. Everything about RSS is state of the art. The steel is the finest Japanese Molybdenum alloy in the world. We are the only company to ever cryogenically temper this grade of steel. You could stop there and make a case for these as the best. The tension is controlled by a ball bearing leaf spring system that will feel like new for years and years. Metal to metal wear in the pivot is eliminated by our teflon pivot glides.  The rotating handle turns effortlessly assuring years and years of outrageous performance.  The Wide contact thumb ring, cradles your thumb in comfort.