While it's really hard to gauge workmanship without holding the thing in your hand, I'd like to point out several nice details:
- See the fine serrations on the rear face of the slide rails? Those will match up to serrations on the rear of the slide. The rationale is to give a non-glare surface facing towards the shooter, making it easier to pick up a good sight picture.
- Note how the end of the slide stop is countersunk. This is supposed to prevent a trigger finger indexed high on the frame from inadvertently pushing the stop out to where it could tie up the gun.
- Instead of a sharp corner to the bottom rear of the frame and mainspring housing, see how everything is nicely rolled under and blended? This helps keep cover garments from snagging on that corner without having to go to the extremes of a "bobtail" treatment.
(H/T to Robb.)