First handgun I owned, still one of my favorites. I picked up an older one - Interarms import pre-SIGArms with the european style heel release. It was already heavily used but not abused when I got it.
It has always been very accurate for me. It has a great DA-SA trigger - even better than newer SIGs that have had the "factory" action enhancement trigger job. I think this must just be what happens when a SIG trigger is very thoroughly broken in.
I had one malfunction, once, with lacquer-coated Wolf ammo and an old magazine with a worn out spring. Never did malfunction with normal ammo, and even with the Wolf it worked fine with fresh mags or fresh mag springs.
Most SIGs are set up for a sight picture where you "cover" the target with the front sight dot. Folks who are used to the "lollipop" or six o'clock sight picture will usually wind up shooting low with SIGs.
If you are not used to the DA-SA trigger, a good drill is to shoot DA-SA pairs. What I do is holster the gun or hold it at low ready, bring it up and get a sight picture, shoot a DA shot, shoot a follow up SA shot, and then decock and repeat. This helps you get used to the DA first shot and transition to a different trigger pull for the second shot. It is also good to get in the habit of decocking before holstering if you are ever going to carry this gun. I am so used to the SIG trigger, I find myself reaching for the nonexistent decocker on guns that don't have them. But if you are going to carry a DA-SA SIG, you need to develop this habit.