As an owner of both the P239 and 1911s, I can assure you that both of mine are reliable feeders! I like my P239 for concealed carry, and I find the BOTTLE-NECK .357SIG to be a very good design for reliable feeding...
My WILSON COMBAT 1911 is my favorite pistol, but I rarely use it for a carry gun, it's just to $$$ to put wear and tear on!
Hopefully the .357SIG cartridge will catch on and not go the way of the 10MM. Right now it is very pricey and uncommon in comparison to the BIG THREE (.45ACP, .40S&W, and 9MM). If you go with the .357SIG P239 you can go between two cals the .40 and .357SIG! A real plus! I don't even own a 9MM. It is a good cartridge, I just don't feel comfortable with it as a self-defense round! The price and availability of the 9mm is the best of the major auto cals, but its reputation as a man stopper are nothing in comparison to my FAV auto cartridge... the .45ACP!
And yes the P239 is that GOOD! I forsee it as being SIGs most popular carry gun for the CIVILIAN market!!!
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SURE SHOT