Compact design, use convenient. I think it is a daily life necessity.
Every family members have smartphone now, that mean every phone have a usb plug. Every one will charge their phones at night. You will watch three, four or five plugs plu in a power strip. Sometime, one power strip is not enough.
This kind multi-functional usb plug will solve these problem. I guess your family members will never quarrel with plug problems.
If your family have a travel, this usb charger also is a necessity. Put it into your bag, luggage or pocket. Lightweight and mini size is best choice.