If you read the original post, the Sig was not mentioned as being a choice. There have been discussions about this all over the internet, and 59brassman does a good job of summing it up. There was even a post here somewhere about using a Beretta 92, and that has good information in it as well.
If you shoot the Sig the best, why not use it? I have been using my CZ-75B, and I have had many tell me that is totally the wrong gun to use. It works for me. This year I am moving to a 1911 as I am going up to Heavy Metal, and my son who is starting is going to use the CZ. Two of the biggest things I see brought up with regards to the DA/SA pistols is the transition, and the dumping of the pistol during a stage. If you know what to do, not a big deal.