The first gun I ever owned (still have it) was a SIG 225
(single stack mag, 9mm) I bought it used from a guy who only put about 100 rounds thru it over a 3-4 year period, and the second time I went to the range, it had several failure to feed problems. I went to the guy at the front counter and asked him what he thought, and he looked it over, said it was real dry, squirted some lube on the slide, handed it back to me, and it worked ok from then on.
But you know, I will never trust the SIG the way I trust my G-21, which I bought brand new. I have put at least 700 rounds thru it, and I must confess, not the best grade ammo either, and it just keeps spittin those bullets out, plus, I am more accurate with the Glock than the Sig.
Only problem is, my 20 yr old son shoots the Glock better than I do!