Katie rides her bike about 50 miles a week as her primary means of transportation.  She was looking into electric bikes as a way to take some pressure off her knees.  After riding several different brands, she concluded that the Bion Intelligent Mobility System was the best fit for her needs.  She told us it felt more natural and in tune with her pedaling. (This is because there is a torque sensor in the rear hub that detects the actual force you apply to the pedals.  Other pedal assist e-bikes have a sensor in the crank that detects how fast you pedal, but not necessarily how hard.)  Another benefit of the BionX is that Katie gets to keep her Giant hybrid that she is already comfortable with and quite fond of.