The Rogers technique is, in my opinion, the absolute best technique when it comes to shooting accurately with a hand-held light.
The technique allows the three free fingers of your weak hand to grab on to the weapon and help to stabilize it. Once mastered, it allows you to shoot every bit as good as you can with a normal two handed hold.
Once mastered, it also allows you to put the hot spot of the light where it is centered around the front sight of the weapon the first time every time.
The Rogers technique is probably the most difficult hand-held light technique to master. When you first try it out it is probably the most awkward and unnatural feeling technique you will try.
On some weapons the Rogers technique can interfere with the function of the weapon. It's particularly bad about ejecting magazines on some semi-autos.
While you can use the Rogers technique with many flashlights, it really does work best with lights dedicated to the technique like the 6Z/Z2 combat lights discussed earlier.
People usually require A LOT of practice to get the light indexed with the sights using this technique. Generally they end up pointing the light at the ground or way up in the air while the sights are more or less on target until they've mastered the technique.