I fondle both on a daily basis at work. The fact is that I have many more customers who have purchased the ultra size Kimbers and love them. I never seem to get any feedback on the Sig 1911's and we don't sell as many of them. It's my observation that Kimber makes many of their ultra sized 1911's a little more carry friendly with rounded and beveled edges. The Sig frames are more squared. All of my personal 1911's, are full size and commander frames of which several are Kimbers. I also have a Kimber .22 rimfire conversion kit that will fit on just about any 4 or 5 inch 1911 except a Sig or a Taurus for whatever that's worth. I can't say a bad thing about the Sig 3 in. 1911 other than it just doesn't feel as good to me and I prefer my 1911's to be from American companies. I've never had any issues with my Kimbers but then I don't own an ultra sized Kimber. But if I wanted a 3 inch 1911, I would lean toward a Dan Wesson or that Springfield EMP is a shooter that has certainly stood the test of time.