From handling the C3, it seems like it is a Commander sized slide/barrel with an Officer sized grip. Maybe it's just me. I did drop SIG an email yesterday, but have not heard back yet. I also asked them about negative feedback I was given from Kittery Trading Post. A sales guy there claimed that SIGs made in Germany are great, but SIGs made in the US are bad. He went on to claim that US made SIGs account for the largest amount of returns they are seeing with handguns. I find this hard to believe. He was trying to sell my buddy a used German made SIG 232 at the time, so maybe it was just sales B.S. Still, it surprised me that he was putting down the SIG name. I have a SIG 228 carry gun that is 15 years old and has performed flawlessly. I have lots of friends with SIGs, and have never heard a complaint. Sure can't say that about some other manufacturers.
I'll update my post with more info when I hear back from SIG.