If it's in good shape, it's a good deal.
I spent my first $300 Bush tax check on a used one a friend had.
It needed some work, but is now 100%. I didn't spend the price difference between it and the next best thing on parts replacement and tuning.
The major parts, frame slide and barrel are all first rate. Some of the smaller internal parts were hideous crap. The leaf spring on mine was bare metal and bright red with rust. The plastic "GI" grips melted to my hand when I cleaned the gun the first time! They must have been made out of something like polystyrene. I replaced them with a set of Ajax fake ivories.
I frequently carry mine concealed and have total confidence in it. I prefer the 200gr. Hornady TAP JHPs in it. Too bad I couldn't find any the last time I needed to buy ammo.