There are hundreds maybe thousands of models of highly evolved e-bikes made in China that have better features and lower cost. In addition to having an e-bike specific frame design that takes battery weight out of the wheel, most of them have removable batteries, which means you can recharge them at your desk at work and they won't get stolen.
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[ 2.6 ms ] story [ 32.0 ms ] thread699$, 250/350W, available q1 2014
There are hundreds maybe thousands of models of highly evolved e-bikes made in China that have better features and lower cost. In addition to having an e-bike specific frame design that takes battery weight out of the wheel, most of them have removable batteries, which means you can recharge them at your desk at work and they won't get stolen.
http://www.rubbee.co.uk/
I can't comment on the efficient of the different techniques though.