To make it short: With this set you get a stable and well-thought-charger, with which one the mains, at each computer and may even invite you in the car. The fragile-looking charger plug to the camera (RX100) must no longer be mistreated and you always have two charged batteries in reserve. Heart what you want more?
The batteries themselves also make a good impression. Because I possess no power meter, I have not tested for hours against the extremely expensive original battery by Sony. But quite obviously they stopped by for a while and after the order this bundle you have more "juice" than you will ever need.
And at a price for which you would not even one Sony battery, let alone get a charger.
The seller is very dedicated, within a day you get the answer to e-mail inquiries, the delivery is free.
The same set of Sony would cost more than three times.
Update after a month use.
The supplied batteries hold really very long. In any case longer than my patience in a recently started testing its capacity: After half an hour of video recording, the battery indicator was still brimming on. And recently I have made a whole day around 150 images, some of them with lightning, almost all with power cycle and in the evening showed the battery indicator still three out of four Stricherl. Thus, very practical and good value for money!