M11A1 is a sweet little pistol, but it does have issues extracting some ammo. I've had up to 20% FTE on some lots of Winchester White Box with mine. On FTE on Blazer Brass. It's run everything else perfectly.
Apart from that, I love it. The trigger slicked up really nicely. My primary P226 makes other Sig owners want to send their guns out to get worked on, and the DA of my M11A1 makes the 226 feel like there's something wrong with it.