The charging power I have not been able to really evaluate this reason. But it is quite possible especially when the size of the 1520 draufzulegen the device so that there is no charge. Likewise, the charge performance over the cabled variant seems to me much worse, which in view of the principle of course is no surprise. For a device with a large battery as the 1520 fall course on stronger.
In summary it can be said that although there is a gain in comfort, but the one bought with some hooks and eyes. The best I can imagine the device on the desk where you have stored on the working most of the time his cell phone. The bedside variant differs for sensitive minds of more. But the price is at least reasonable, as opposed to the charging pad, which I think is grossly overpriced.