I posted it because it's made by Motopower, the same company that made the ones that are on my bike right now. That's why I recommended it; because I have ones from the same manufacturer, and they work well.
You asked me what made it cost 200 percent more than all the other units that are out there, and what made it better than all the admittedly unnamed brands you'd already looked at; how would I or anyone else know that unless we worked for Motorpower, or had made a comprehensive study of every single USB outlet? You were looking for recommendations for power outlets, and you got some. If you don't like the recommendations or the price, then don't follow the recommendation, simple as that.
Cheers to you too.
"No matter where you go, there you are."