I've never had a problem with my P238, purchased in the spring of 2011. I have probably put 600 rounds through the gun. I haven't tried a variety of hollow points, just some winchester. Range ammo is exclusively round nose FMJ rounds. Never had a failure to extract or feed a round (knock on wood). Using the Sig factory mags. I did recently replace the recoil and firing pin springs with new springs from Sig. Probably didn't need to, but figured it can't hurt to keep good springs in the gun. I'd rather change them out early than wait until the gun starts having issues. I lube the slide rails, frame rails, and barrel surfaces that contact the frame with Brian Eno's Slide Glide.
I will say that the times my sig has run rough have been when it is on the dry side. Keep it well lubed with a bit of grease or good oil. Also, the recoil spring should be a flat ribbon of wire, not the typical round wire spring. If you have a round wire spring, call sig and they will likely send you a "reliability pack". If you are having problems with it that aren't solved by lubing or changing ammo, call Sig. Seriously, just call them and let them deal with it. That is part of the premium you paid when you bought this gun was for their support.
Right now I wouldn't let my Sig go for much of anything. It has been a reliable, accurate gun that is perfect for pocket carry.