Its more important to learn SD tactics, trigger control, reloadiong, cleariong jams, etc. There is an awful lot to learn here. If you are in good shape here, which 95% of folks are not (includiong me)..learn this stuff first. Then go to the laser. IMHO
An accomplished shooter can easily get 3 shots on target going from the point that the arms are close to the body (right after the draw)to extended in no more than 2 seconds. A laser will likely slow you down. None of my instructs favor them. Now that doesn't say other and even better instructors do favor them.
Full discloser:..I have never used a laser on a handgun.