Bought my SR40C back in April of this year. Took it to the range a couple of days later and almost LOST it!!! Yep, the wife shot it and almost wouldn't give it back! I had to promise to buy her a SR9C.
I have run about 400 rounds down the barrel and found the 40C to be very reliable and accurate. Since I carry the 40C for work with the 17-rd mag, I had to qualify with it - shot 100% in a combat course. NEVER did that with my Sig P229 before I retired from my previous employment.
Out of all these times on the range, I've tried everything from cheap ammo to the expensive stuff. No problems with any of them. The secret I feel is watching some of the videos on cleaning the weapon. I read all the reviews and forums about the striker channel being loaded with grease and shavings. IMHO, that is the most critical issue in making sure you get good strikes, as well as proper feeds. When I first received my 40C, before I ever shot it, I cleaned every part of the gun. I've had no problems with it and I stake my life on it every day.