Will be following this with interest. I am testing a P226 w/ E2 and SRT as well. If it runs, I will pick up a backup and switch back to Sig full time. Interestingly, I am also torn between a second P226 and a P229 for the backup. I carried a P229 40 on duty for years and wound up loving the gun. I have stupid big hands though and the P226 always seemed to fit better.
As far as current Sig issues, it seems like they either run out of the box or they don't. Even if they run you still have to watch out for small parts breaking prematurely, especially take down levers and trigger bar return springs. My old agency (around 300 sworn) traded in their old Sigs for new ones a few years back. I spoke to the lead FI and he mentioned that those two parts seem to be the ones to go when something breaks on the new guns. I am thinking I might just replace all of the springs and the takedown lever every 5k when it is time to change the recoil spring.
JV, have you tried the E2 on the P226 yet? I only have around 400 rounds through mine, but I have to say that I am not a fan of the grip. It is far too small if you have big mitts.
Whatever Sig has going on in the QC department, the P series guns are still ridiculously accurate and the DA/SA trigger smooths out very quickly. Despite how popular striker fired guns are, I think a good DA/SA trigger is about as full of awesome as it gets, especially with the SRT. The DA is fantastic for the press out and the SRT offers a short, positive reset.
One thing that I never noticed until spending a long time with Glocks and then going back to Sig is that the P226 feels like it takes forever to cycle. I don't see any difference on a timer, but it just feels slower.
Good luck! Keep us posted.