At the risk of being repetative, I'm going to echo some of the opinions already stated. Last year I shot with an M&P9, which was, along with the Glock 34(and 17), was by far the most common pistol used. Even in the SSP division most had been modified with FO sights, lighter triggers, and stippling where allowed. A few people would shoot a Sig or other DA/SA guns, but they were few and far between. The "gamers" (myself included, my M&P isn't stock) rule the game.
That being said, I'm going to shoot a CZ75 Shadow this year. It's more for giggles and to practice with a different gun than anything else. I doubt, at least initially, I will shoot to my classification of expert. I will most likely be shooting at the SS level initially as I get used to the pistol.