During my career as a U.S. Customs Special Agent, I had the opportunity to be issued a 3953 as a concealed carry pistol. I LOVED that pistol. It was accurate, and for having a DAO trigger, it was smooth and had a decent trigger pull, and it was very accurate.
It was my daily carry pistol, and only left in the car if we were doing tactical operations, and I used my Glock 22. I carried the Glock 22 in a thigh rig, so concealment wasn't a concern.
I carried the 3953 until the entire agency went to the Glock 19 and 26.