Ruger makes fine firearms. I am not a fan of their semi auto pistols though, but the price you can get it for is certainly good. The only reason I am not a fan of them is I do not like the feel of them, as compared to other brands.....its certainly just personal in that aspect and nothing to do with quality issues. Their revolvers and rifles are especially hard to beat dollar for dollar. And BTW the Ruger KP89 (9 mm model) wa runner up years ago when the military wa looking to replace the old standby M1911 45 cal pistol. Rugers 9mm finished 2nd in a heavy bout of testing against most all major manuf of pistols, such as colt, S & W, Glock etc.
Its an aluminum frame, so keep it clean and lubed to prevent premature wear, but most all semi auto today are alum anyhow, so its not any better or worse in that aspect.