For the difference in money and performance, I would consider IZIP E3 with lithium option. I've had one for 2 years now, love it. Not problem free. I'm 6'1", 220 lbs so I had to upgrade to heavy duty rear spokes because I'm hard on the bike. Throttle stop broke ($40) after 18 months. Bought second battery (lead acid) for extended rides. With lead acid, I can make 15 miles or miles out on power assist and then, with lithium, I can race back 15 miles at full-throttle and hard pedal with power to spare. Great workout, 80 lbs with two batteries. I've lost 35 lbs since I've owned the bike. I ride 40 to 80 miles a week. Wore rear tire out at about 13 months. I live near Gulf of Mexico, so cheaper plated parts are starting to rust a bit. It was recommended to me by bike shop owner at Energy Conservatory, Dunedin, Florida as "great starter e-bike" and it is. Great shop too.