I had a 4" 625-8 from 9/02 - 6/04, and bought another 625-8 4", the 625JM, 2/05. It now has 5k+ rounds through it. The hardchromed hammer has no apparent wear on it. I did round off the sharp edges on the grooved trigger, also hardchromed. The spring loaded front sight is a Godsend - seconds to swap between the OEM gold bead Patridge and my current favorite, a reddish HiViz - the 5" 625 requires a pinned sight blade replacement.
My original 4" 625 had a miserable trigger and stock charge holes as delivered new; the 625JM had a good trigger and eased charge holes, which make RN bullets all but jump into the chambers. The 625 comes with the usual Hogue open backstrap rubber grip, the 6125JM has Miculek's excellent wood stock - which you can grip a tad higher, reducing the muzzle flip. The MSRP of the 625JM is $40 higher... it is a bargain.
Now, if you can barely stand a 1911's recoil, the 625 is a bit rougher with ball ammo, as there is no recoil mechanism to use up some of the recoil energy. You can fit the Hogue .500 Magnum monogrip, as fitted to .460 & .500 Magnum S&Ws - $35 from S&W Accessories - and it covers the backstrap at the expense of ~3/16" more trigger reach (Try a dealer's .460 or .500 for your fit!). That grip fits K,L,N. & X-frames! If you are left handed, well, you'll hate most DA revolvers already... neither of these will improve that (Sam Colt was a leftie - SAA's and clones are leftie-friendly!).
After years of 4" 625 use, including 4" 625MGs in .45 Colt & my 4" h-l 629, the 5" 625 just doesn't fit me well. YMMV.
Stainz