I've not tried one, but the concept, to me, seems daft being an unnecessary complication. I guess it's not a QR wheel and free-wheel gear-set only. When you have a battery on a rack, you have loads of options for replacement/upgrading etc. Its advantages are that it brings the weight lower, but the weight of a 10aH battery is hardly noticeable anyway, and it saves a bit of size for folding.
Wow what an unusual design. I wonder how that handles with all the weight on the back wheel, would the spokes hold up ok? It might balance out well with the motor at the front eh. The bike doesn't look bad either. I think that's a really good price. It's certainly giving a very competitive market with new offerings appearing all the time
