“Seems like a good quality unit and and works fine with my Raspberry Pi 4. It was reasonably priced and therefore it was not worth risking some of the dubious looking alternatives. I presume the extra 0.1V (on top of nominal 5V supply) is to give some headroom to allow for some voltage drop in the cable and connector. The Pi 4 seems to be quite fussy about supply voltage.”
“Not much more expensive than a generic PSU but at least I know this is rated correctly for the Raspberry Pi, which can be a bit intolerant of lower quality power supplies.”