Stocks and sights on the 625-3 may depend on when it was made and which barrel length, but...
I bought my 625-2 NIB in March, 1989, s/n BDC06xx. It came with a plain black ramp front sight, plain black rear sight blade and Pachmayr 'Gripper' finger groove stocks, blackened brass Pachmayr logo medallion on both halves, moulded with the little 'window' in them so you could read the s/n on the butt if the sun was just right and you squint real good. Markings are roll marks, "45 CAL MODEL OF 1988' on the right side of the 5 inch barrel with the large S&W logo on the sideplate. I never saw an original shipped any differently. It shoots pretty well.
I bought my 625-3 NIB in March, 1991, s/n BEN31xx. It also came with a plain black ramp front sight, plain black rear sight blade and the same Pachmayr 'Grippers.' The gun has the longer cylinder stop notches, and accompanying lockwork changes, that were part of the N frame "endurance package" The frame markings are roll marked, with the small S&W logo on the left side of the frame beneath the cylinder latch. The markings on the 4 inch barrel are lazer etched, "SMITH & WESSON" on the left of the barrel and "45 CAL MODEL OF 1989" on the right side. It shoots pretty well, also. There was some variety of features on the 625-3's while they were produced.
As for the "quality" of the 625-2 1988 Model, they got a black mark in many's eyes due to a faulty test gun shipped to J.D. Jones, owner of SSK Industries, who then savaged it in print (AMERICAN HANDGUNNER magazine). He returned it to S&W, who "fixed" it and sent it back to Jones, who reported it still had the same issues. I don't recall what the problems were. The content of older issues of the magazine are probably online somewhere.
These guns were hot sellers. I bought the first one to hit my town's biggest dealer, and I had a number of shooting friends buy them. Mine has always worked perfectly, as did theirs. Most of the gun mag writers who commented on Jones' writing had their own samples that worked and attributed Jones' gun's problems to the haste which the early guns were likely assembled and shipped to writers for evaluation.