I like CTC sights for a couple of reasons.
1.) Allow aiming without needing to raise sights to eye level. This is particularly useful imo if you're injured or unable to get an ideal sight picture. You can basically aim the pistol from any position, freeing up the rest of your head/body to hide behind cover, etc.
2.) Faster than irons, particularly during a string of fire. I don't know if this is because I haven't trained enough with my pistol, or recieved the right training, but accurately double tapping multiple targets is far faster for me with CTC grips. Pistol sights tend to bounce around when moving and/or shooting, so using a laser dot as a guide instead, works well for me.
Couple of drawbacks though
- Parallax. Laser is only dead on at the distance u zero it to. Shoots high right/low left (IIRC) at distances beyond/within point of zero.
- Gives opponent nice red dot to shoot.
- May discourage proper stance and grip--key to fast follow up shots.
Over all, I like mine. But, after all, it may be because I spent the money on one, so I could be biased.
