Many people are faster and more accurate with lasers. It works for me, but you won't know if it works for you until you try it. They are VERY useful for self defense -- a situation in which most people don't use their iron sights and miss the majority of their shots because they are too focused on the threat.
As far as reliability -- CT lasers are more reliable than the guns they are on. I've been using lasers for 20 years without a malfunction. I've been shooting for less than a year and have already had more than a half dozen malfunctions relating to guns or ammo.