Finally something I know something about...
Fewer slide serrations, fatter grips, plastic magazine floorplates, and I hear minor changes in the internals... (I can't detect any changes, but I don't have the 230 anymore to compare). The front sight is still integral to the slide (not dovetailed). Available in many flavors: stainless slide and frame, blued slide and blued alloy frame (lightest one), stainless slide and blued alloy frame. But the only way to go is the all stainless with Hogue grip and night sights. It's a rare version, but they're out there. I bought the first one I saw, and I wouldn't trade it for Britney Spears. It's terribly nice. Only thing I changed was I bought stainless floorplates for the mags directly from SIG.