Keep in mind that the CTC grips are not designed for bullseye competitions. They are designed for fast and accurate target acquisition under stressful conditons (self defense). In any situation where you can't get a traditional sight picture you will still be able to hit the target with a CTC grip.
As for the point of aim issue, the CTC laser diode is on the right hand side of the gun and a tad below the barrel axis. The grips are set from the factory at 50 feet and are fully adjustable if you want to change the intersection point. The Lasermax models are not adjustable. I recommend setting the grips at about 30 feet for everyday CCW carry.
A factory set grip (50 ft) will have the point of aim and point of impact hit at 50 feet. At point blank range (with POA still set for 50 feet), the point of aim will be approximately 0.5" low to the right from point of impact. At 100 feet (still set for 50 feet), the point of aim will be approximately 0.5" high and to the left of point of impact. So you're looking at about 1" of variation from 0 to 100 feet. the VAST majority of shooters can't hold a group any where close to that, especially under self defense conditions.
As to blocking the laser with your trigger finger, a little training will fix that. Practice indexing your trigger finger directly out onto the trigger guard. This will also allow you to bring your finger straight back onto the trigger when you're ready to shoot. There are people who can't reach the trigger guard or who have sausage fingers...and in those cases you'll just have to figure something out that will work for you.
The other huge advantage CTC has over the other laser systems is the "instinctive activation". When you grab the gun, the laser is turned on by your grip. The other systems require some kind of fine motor skill manipulation, which you WILL NOT be able to due in a high stress situation.
Lastly, the LM system has a fatal flaw in that WHEN it breaks (and it will) it will render your weapon useless. Replacing the factor steel guide rod in a firearm is not a good idea since it gets a lot of stress during the firing of the gun. I've had 3 Lasermax units break on me in training situations and all 3 prevented the weapon from working. It took 45 minutes to get one of the guns apart after it broke. *IF* the CTC unit fails, you still have a working firearm and can transition to your iron sights.
When you start taking advanced tactics classes the lasers *really* come in to play, allowing you to make shots you'd never be able to make without the laser. I *highly* recommend a laser on your carry/home defense gun.
well, i hope that i`m not a bad shooter 
