Got the Sig back yesterday. I blasted 50 rounds of Winchester white box and 50 reload rounds, all hardball, doing medium and fast double taps. Seems to be fixed, but I won't feel comfortable with it until around 1000 round count. The first failure before the return was on the first magazine fired, so it does look promising.
They did give me a free Novak magazine, so I don't mind the shipping cost so much now.
I plan to install a 18.5 lb wolf recoil spring and a full length guide rod ASAP.
Notes said they polished the throat. It looks like a completely different throat, so they definately throated the frame and barrel. They replaced the extractor. The tension is much lighter and the bottom of the hook is rounded, which is the first thing I would have done, if I didn't have such an aversion to grinding on a gun that now retails for $1100 to $1300.
They sent me a Sig Sauer sticker that says "SIG SAUER, To Hell and Back Reliability".
From the reports I have heard it needs to say: (except for our GSR).