I had two (just sold one, and the other is on consignment), one an early 80's gun, the other a late 90's gun.
The early gun had a lot of holster/finish wear, plain sights that had a weird number combo and were definitely regulated for a specific individual. The smiley on the barrel showed pretty heavy use.
The newer gun looked pretty much new, had the typical commercial SIG bar dot sights. The smiley on it was barely visable, and I dont think it was shot much at all.
Both had heavy DA triggers, and decent SA triggers. I replaced the mainspring on both with P225 mainsprings, which brought the DA trigger more in line with the commercial SIG's triggers.
I also replaced the sights on both with Meprolights.
Both my guns fed hollow points without issue, and I dont believe the older gun was ever modified, as from pics I've seen around of both the later modifications and the original, mine looked like the original. The later gun had the modification.
Check out Top Gun Supply for parts and mags, they can help you with spring upgrades, and they also have an armorers CD thats well wrth more than they charge. It will walk you through a complete tear down and reassembly of most P series guns, and has a specific section on changing out the mainspring.
Good luck on the hand select. Most places grab five guns and pick the best of them. They dont pick through a crate. Hopefully, you luck out. Either way, I dont think you'll be disappointed, mine were both good shooters.
I'll probably have a half dozen or so mags available here as soon as the other gun sells, if you twist my arm, I might could let them go.