OK, I went to the range on Saturday and put some more rounds through the Sigma. My report here won't be as pretty as some of the reviews you will read, but at least I can convey my thoughts on it.
First thing about the Sigma..... It's ugly. Very blocky construction, but makes up for it a little being that it's two tone. You can tell it was designed for function rather than form. The feel on the other hand is great. I didn't know what to expect with the grip on a firearm designed for a double stack magazine (being used to a single stack frame and all...), but it fit my hand really well. The grip angle is almost exactly the same as my 1911, so the gun pointed very naturally, and the sight picture made finding the front sight and target acquisition a breeze. The lack of an external safety also threw me for a moment, since I'm so used to having a safety to plop my strong hand thumb on while shooting.
Firing. With all of the other .40 cal weapons I have shot, the recoil was snappy to say the least. I used to equate the .40 to .380 as far as how jumpy it is, and the felt recoil, but with the Sigma, it was noticeably different. the recoil was extremely manageable and light. Muzzle flip was minimal, and putting the sights back on target for follow-up shots was quick and easy. This surprised me quite a bit! The trigger, however, will certainly take some getting used to. It has a very long, very heavy pull. It's heavier than my 625, but not nearly as heavy as my 642.... probably right in the middle. If I had to guess it's about 8-9 lbs. The up side is that the pull is smooth and consistent for each shot. The first magazine I put through it was minute of bad guy, but hardly impressive. By the third mag I was putting nearly all the rounds in a 3 inch circle with an acceptable flier every fifth shot or so. It's nothing that one couldn't get used to, and for the DAO revolver folks out there, it would be like stepping into a well worn pair of shoes.
The action is similar to that of a Glock in that it acts like a DAO, but does need to be "cocked" in order to fire. It also has the same type of trigger safety that Glock employs in that if your finger is not firmly on the trigger, it cannot be pulled back. Internally it's visually identical to a Glock 19, but there are differences in the FCG. It can be field stripped the same way as the Glock as well.
Through the 100+ rounds I put through this one, it fed, fired, and ejected reliably without a hiccup of any sort, all with using cheap blasting ammo. This will eventually replace my Kimber as a primary carry, since it is cheap enough to be disposable, and I won't cry over beating the heck out of it, I'm just tired of watching a $1200 gun get beat to hell through daily carry. It has all the good features of a Glock, and none of the features that keeps me from buying one.
If anyone here wants to give it a whirl, bring some expendables and meet me at the range. It's a fantastic gun for the money.
If you're reading this, there are better than even odds you are a d-bag.