The important bit with light techniques is to understand them and to have enough familiarity with them to know whether or not X or Y technique works for you. I can use the Rogers technique fairly well because my hands are sufficiently large to let me operate the light and still get a meaningful grip on the weapon with the remaining fingers of my left hand. From a pure shooting perspective, I've found that I don't suffer much of a penalty in my ability to put rounds on target on command over using a standard two handed hold.
But that's the thing that Nyeti and others are hitting against: Rarely is use of the light something you're doing in a pure shooting situation. It typically involves searching and if you are a right handed shooter and you encounter a corner that opens to your right, you now have to move the light to the other side of the gun if you want to do anything but illuminate the wall in front of you. When you actually start searching through real structures (because crackheads do not hide in shoothouses or at eye level) you start to find out that there's no single technique that is going to get it done in all circumstances. The Rogers technique is something I would likely employ for a bump-in-the-night scenario where I'm a static defender of home and family. In that situation I'm not terribly worried about pointing my gun at a potential intruder and I really would like to be able to shoot as fast and accurately as possible. I've also spent a considerable amount of time practicing with the Rogers technique so that I can use it without much fuss. That being said, I keep an X200 on the pistol when it is doing night stand duty 90+% of the time so it's a moot point.
If I'm not playing static defense and instead I'm forced to go looking for a potential problem in my house, I'm likely to use a more "free" technique if I feel the need to have a gun in my hand...something like the Harries or jaw index.
I like the Rogers technique more than any other in terms of putting bullets on a target on demand...but if I'm not on a square range or a situation which gives free license to have a gun in my hand and not care too much about who it gets pointed at, I'm probably going to be using something else.
EDIT - Since Harries was mentioned specifically, I find that when properly applied with the isometric tension it helps with my ability to place an accurate shot. It's not as good as a two handed hold or the Rogers technique, but I find that the stabilization of forcing the back of my hands together helps compensate a bit for a sub-optimal trigger pull a bit.