I've owned a P228 for almost 6 years now.
On my first trip to the range, I loaded the mags with several different types of ammo--two of this one, 4 of this one, 3 of this one, etc..
After several thousand rounds, and quite a bit of abuse ("It has only been 3 months since I cleaned this, don't need to bother yet...), it has never failed. Not to eject, not to feed, not to fire, not to impress.
My girlfriend fell in love with it at first sight. Hopefully I'll get it back someday.