NO, It is NOT a good thing for your car.
I would not do it, when the gas pump clicks off, I would stop pumping.
If you do, you could be damaging your emission system.
There is a fuel vapor return line in your fuel system, when you over fill the tank, the vapor return line is now filled with liquid gas and flowing backwards and saturating the carbon canister which will make pull the emission related engine code. (you will have to replace the carbon canister).
I could be wrong, if I am, please let me know.