Expensive, I would say, but it has the advantage that it is the only charger that fits completely into the socket and does not protrude at all. I would not buy it to charge my phone, there are better and cheaper options, but it is convenient when you don't want the charger to stick out for some reason, like a child not being able to remove it, or if you don't want to accidentally unplug it or if you want to have a power supply for something in a visible spot and you don't want the charger to be visible.

While it is very stylish, unfortunately it does not work well with all devices.
Samsung mobile charges quickly (reaches 1.5Ah), Asus tablet charges almost 1Ah, while Lenovo mobile charges extremely slowly (it must be working at 0.5Ah).