If I'm honest: Charging via USB is for me partly a closed book. I specially bought myself a small USB-meter for voltage and current, to find out why the store sometimes "back takes a little longer". As the main culprit I could so after all, ever identify the charging cable, the partially loaded only with minimal power. Under maybe 20 different cables were just 2-3 left, showed good values. Short cables with thick cross-section are to be preferred, but there are also exceptions. Even and especially "original cable" that come with the tablet or the smartphone, do not guarantee fast loading times.
But also my tablet so I could expose a bitch, which loads only fast if the USB cable already is under tension when plugging. Maybe I will one day have to understand the extent to which equipment and loaders "entertain" a suitable cable as to which is the appropriate charge current and probably why the charging current is changed from time to time in both directions.
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The advantage of this variant lies in the charger (removable) power cord; the use is simple variable and hideaway than if the cables and devices around the wall outlet decorate - even if the charger quite stylish and comes therefore is very well made. Practical: the switch.
The charger provides otherwise unspectacular and swiftly (1.5 amps each at each of the 4 ports) its task: load equipment. It is worth mentioning for me rather what it does not do: warm up or make noises.
