I looked at the bike and I'm not convinced.
Most of the 'benefits' listed for the shaft drive are actually just bvenefits of the internally geared hub, which are found on a lot of chain-drive bikes that are lighter, easier to maintain, more efficient, and cheaper. And available in more sizes and styles of bike. And this is not even considering the poor quality of the shaft-drive bikes I have tried... if the quality is similar (and I can't imagine it would be to far off for the price) then it is certainly not something I would buy.
If you have a reason why getting rid of the chain is so important that you are willing to deal with the drawbacks then it might be a good choice for you.