My carry gun is a Beretta 96D DAO. The double action trigger is smoother than on the DA/SA version of the same gun. (One recent post by another noted that the use of a D model hammer spring is a factory recognized modification to enhance the DA pull of the DA/SA version of the same gun.) The absence of a decocker/safety makes it simple to use. The time from shot to shot is slower than an SA or safe action gun like the Glock, but I find the entire cycle to be smoother although the pull is longer and heavier. I read a recent article about the Border Patrol picking a variant of the 96D as their duty gun. Their pattern of encounter involves substantially longer ranges than usual police encounters, and they chose DAO. One day on a lark, I started practicing at 50-60 yard ranges, and I could understand what they were talking about, because it was possible for me to keep the sights aligned through the entire stroke, unlike my personal experience SA or safe action guns in the 5.5-8 lb. range.
It's not for everybody. It may not fit you, and it takes more practice, like if you were going to use a DA revolver instead of a short stroke semi-auto. My hand and fingers are such that my trigger finger makes perfect contact with the DAO trigger, and I get to have that for every shot. YMMV
May be a bit big, though, but that's another subject.
