My understanding of serrated is cross-wise, not along the trigger length, as the 625JM's trigger is grooved. Mine is an early production unit, but it's trigger has never been 'funky' at all - exemplary is more like it. Mine was deemed a deal back then - the shop that ordered it for me sold it to me for $10 less than either the standard 4" or 5" 625-8. Then, it supposedly had a BOSS mainspring (It looked like a stock leaf!) and an 'improved' trigger, which actually turned out to be a ground down modern strain screw - which intruded into the 'tunnel' of the Wolff replacement spring, decreasing the DA trigger effort at the expense of a too low spring pre-load. A call to S&W got a standard spring gratis - I don't believe they do that anymore. It also had 'eased charge holes, which turned out to be eased interior edges of the ejector star. That, combined with moonclipped FMJ RN 'ball' ammo reloads as if on a tractor beam.
I don't know Mr. Cunningham, but my 625JM - and two others later bought by local friends - have been fine examples of modern S&W revolvers, save that sharp edged trigger. BTW, .45 Auto Rim cased ammo is fun, too - and loads with HKS #25 speedloaders (Not #25-5!). The headspace is a bit closer - I've never had an Auto Rim cartridge, no matter the primer - or source (GA Arms loads .45 AR Starline cases.), give a ftf.
Stainz