The charger itself is smaller than most car chargers. It fits nearly flush with the dashboard of my car which makes it harder to accidentally bump or yank out. Despite it being so small, it is easy to remove when necessary.
As far as charging speed, this charger charged my iPhone 50 percent in about an hour, which is better than most chargers. This is not a quick charge charger however, I can definitely tell the difference between this charger and my older one.
Would highly recommend.
EDIT: added photo of the charger with size comparison to my finger.