Make sure you get the "E" model (Enhanced).
May have other letters in the model (if you're talking used)-just make sure it has an E. Fer example, back when they came with night sights, etc, they sold a VE model (Value Enhanced)-the Value model had no night sights, etc. Enhanced models have a number of improvements over the originals.
Got a couple myself-underated, unappreciated (got a bad rap from some in the Glock herd), hard to beat for the price, feels great in the hand (added a Hogue Hand All slip on grip), as accurate as any other SD gun I have. Some folks gripe 'bout the trigger, but since I grew up on DA revolvers, I'm not very trigger sensitive.
Got some fancier, pricier stuff, but my bed gun is a 9mm Sigma with an Insight light on it.