Got my first JM Special in 2006. It was not as good (for me) shooting bullseye as was my Model 1989 with the full lug barrel. The 1989 was better in timed and rapid fire, and also had a slight edge in accuracy. Got my next in 2012 for the low price of $400, but had an offer to sell soon thereafter for $1500. No hesitation. Been looking for one since 2012 and finally had the opportunity.
Took it shooting yesterday for the first time and found out a few things I'd forgotten about this gun. Even though the barrel is on straight the rear sight blade is well off to the right for the sights to center up the group. It also recoils significantly more than the 1989 with the same round. Lighter weight and all of it comes off the front of the barrel. Slower to come back on target in rapid fire, at least when shot one handed. The action is superb and the accuracy is very good given I was shooting ammo not tailored to the gun.
In my opinion, JM moved away from the 625 platform for several reasons:
a. Limited round count
b. Too much recoil
c. Too much cylinder inertia (all you old PPC shooters know what I'm talking about)
The other JM Specials using 38 Super and now 9mm improve upon the original in all three areas.
Keith