SR9's with 330 as the prefix in the serial # have been recalled. Apparently if dropped the gun can fire with the manual safety off. I'd hold off a little while longer, unless you can get a good deal on one, then just send it to Ruger and they'll do the retrofit free of charge.
It's a 9mm/ 17+1 round capacity. It's Ruger's first non P-series and is striker fired instead of an external hammer. It has a SS slide on some type of polymer frame, based loosely on the P345. The backstrap can be reversed from flat to arched, and it has a manual thumb safety for us 1911 guys! It also as an accessory rail. MSRP is about $525 ( includes two 17 round mags and a mag loader. Here's more: www.ruger-firearms.com