Anyone ever use these super chargers?

[GoldOxide_imp]

I don't see the point of it, a solution looking for a problem, especially at that price? You can buy a €10 USB block and fused cable and achieve the same thing with it attached to the bars. Those USB ports are very exposed to water ingress, it will last 10 minutes in any damp climate. I had the OEM Honda cigarette lighter outlet in my Africa Twin and used to use those little USB plugs in them to power my Sat Nav or Phone, it used to eat USB plugs with the rain. I'll never understand why manufacturers don't put USB ports facing down in any faired bikes so they are protected from the elements and any water on the cable would run away from the port.

Even this phone holder here has a little common sense, the USB port is facing down so it is not so exposed to rain. https://www.ebay.ie/itm/Adjustable-Alumi...SwoDFbf88e

(But there is always a flaw in the cheap Chinese stuff, I bet that on/off switch isn't waterproof)

Agreed. Weak thought given to port protection in many offerings. Yeah, that power switch, although thoughtful, looks dubious.