Picked up the Magnum Navigator 4 days ago. I am a 70 year old male, 5'9", 245 lbs. First impressions are good. The bike has done well on the few hills that I have climbed. I have biked mostly flat areas here in northern Ohio. I have gone 35 miles and the charge is still showing 3 of 5 bars left on the bike computer or 2 of 3 lights on the battery. I average 12 mph, in power level 1 or 2 and do peddle most of the time. Only rarely use the throttle. I did 10 miles on a bike trail with some hills and was not overly fatigued. The most I could do on my Specialized Roll bike was 4 miles. I am having a blast using the bike. I am impressed with the battery range so far. Also, I had both knees replaced 4 years ago and just recently started biking again.