The wide mirror is different then the conventional mirror in the fact that objects look closer than they appear. The distance between vehicles looks a little bit shorter then in the conventional mirror. The same goes for the speed vehicles are driving, it looks a little bit slower. Still the human eye can adjust to the new view and estimate correctly the distance between vehicles and the speed they are driving. The benefit is a much wider view then the conventional mirror.
Based on your height, the height of the mirror and the height of your seat , there will be some blind spots. In some cases your head will cover some portion of the window of the back left door. Give your self a few weeks to get familiar with the view that this mirror provides.