The Mirider is basically the same as the Onebot, which costs around £700. It had/has a big marketing campaign, which is probably why it costs so much. A representative came on the forum and argued that they had special stuff in the Mirider, but what he said didn't really stand up to scrutiny. Without studying both, I'd say that there might be some minor improvements in the Mirider
Thread here, which is basically a review:
Has anyone else got one ? What do you think ? I wondered too as I will want to replace my Birdy witha pedelec soon.
www.pedelecs.co.uk
Whatever you buy, one consideration should be who's going to fix it when it goes wrong. You'd be lucky to find a local dealer who would fix one of those sorts of bikes. If you can fix things yourself, Id go for the Onebot, mainly for the price, but also because it uses standard Chinese parts that are all replaceable and upgradeable.
One thing that would put me off is the lack of gears. That's fine if you just want it for emergency transport for a few miles, or your 1 mile dash to the station every morning, but not much good for touring.