Michael Swrote a review of Eagle Creek USB Universal Travel Adapter on January 23, 2019
Familiarity: I've used it several times
First big problem that I didn't notice until too late is that you cannot connect a grounded (3-prong) plug into this, so I wouldn't consider it very universal.
I primarily got it for my laptop, a grounded plug, since it's easy and cheap enough to just get a charging block for your phone wherever you go.
Also when I used the connection needed in Korea it did not fit into the socket well. It was so loose it needed to be propped up, so it wouldn't fall out.
It has worked alright other than those problems, but you'd be better off finding an alternative. I don't think this is worth the price even at half off.