We just picked up a E-Caliber 9.6 for my wife and I must say, this is one sweet bike. It is just under 40lb with battery and under 30lb without. We lucked out in finding a used one..I say used because it did have a previous owner who bought it for his wife but I doubt the bike had 5 miles on it...
I was getting a 550 Error code on my Cannondale Habit 2 Neo and it turns out it was the cable that would go to the front headlight was touching and was shorting out. I put some tape on the wires keeping them seperate and no more 550 Error.
I'd like to spend some time on a sub 40lb bike before I say weight matters. I like the idea of a lighter bike, smaller motor smaller battery, lower top end (10-12MPH), with a range of 20-30 miles.