The Threepersons is a great holster but it is difficult to conceal and it is banned by every gun game known to man due to the exposed trigger design. I have one and I never use it.

But I am very fond of the El Paso Street Combat. It's a pancake type holster than can be concealed very easily and I use this holster to conceal most of my large frame revolvers.

Back when the IDPA allowed the 5" 625 to compete, one of the fastest draws I ever saw was this revolver drawn from a Kramer Belt Scabbard made of horsehide. That is one tough, tight holster and I'll never understand how the shooter could get the gun out so fast, but he did.

Dave Sinko